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Theorem List for Metamath Proof Explorer - 31201-31300   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremdffv5 31201 Another quantifier free definition of function value. (Contributed by Scott Fenton, 19-Feb-2013.)
(𝐹𝐴) = ({(𝐹 “ {𝐴})} ∩ Singletons )

Theoremunisnif 31202 Express union of singleton in terms of if. (Contributed by Scott Fenton, 27-Mar-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
{𝐴} = if(𝐴 ∈ V, 𝐴, ∅)

Theorembrimage 31203 Binary relationship form of the Image functor. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V       (𝐴Image𝑅𝐵𝐵 = (𝑅𝐴))

Theorembrimageg 31204 Closed form of brimage 31203. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
((𝐴𝑉𝐵𝑊) → (𝐴Image𝑅𝐵𝐵 = (𝑅𝐴)))

Theoremfunimage 31205 Image𝐴 is a function. (Contributed by Scott Fenton, 27-Mar-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Fun Image𝐴

Theoremfnimage 31206* Image𝑅 is a function over the set-like portion of 𝑅. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Image𝑅 Fn {𝑥 ∣ (𝑅𝑥) ∈ V}

Theoremimageval 31207* The image functor in maps-to notation. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Image𝑅 = (𝑥 ∈ V ↦ (𝑅𝑥))

Theoremfvimage 31208 The value of the image functor. (Contributed by Scott Fenton, 4-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
((𝐴𝑉 ∧ (𝑅𝐴) ∈ 𝑊) → (Image𝑅𝐴) = (𝑅𝐴))

Theorembrcart 31209 Binary relationship form of the cartesian product operator. (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Cart𝐶𝐶 = (𝐴 × 𝐵))

Theorembrdomain 31210 The binary relationship form of the domain function. (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V       (𝐴Domain𝐵𝐵 = dom 𝐴)

Theorembrrange 31211 The binary relationship form of the range function. (Contributed by Scott Fenton, 11-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V       (𝐴Range𝐵𝐵 = ran 𝐴)

Theorembrdomaing 31212 Closed form of brdomain 31210. (Contributed by Scott Fenton, 2-May-2014.)
((𝐴𝑉𝐵𝑊) → (𝐴Domain𝐵𝐵 = dom 𝐴))

Theorembrrangeg 31213 Closed form of brrange 31211. (Contributed by Scott Fenton, 3-May-2014.)
((𝐴𝑉𝐵𝑊) → (𝐴Range𝐵𝐵 = ran 𝐴))

Theorembrimg 31214 The binary relationship form of the Img function. (Contributed by Scott Fenton, 12-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Img𝐶𝐶 = (𝐴𝐵))

Theorembrapply 31215 The binary relationship form of the Apply function. (Contributed by Scott Fenton, 12-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Apply𝐶𝐶 = (𝐴𝐵))

Theorembrcup 31216 Binary relationship form of the Cup function. (Contributed by Scott Fenton, 14-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Cup𝐶𝐶 = (𝐴𝐵))

Theorembrcap 31217 Binary relationship form of the Cap function. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Cap𝐶𝐶 = (𝐴𝐵))

Theorembrsuccf 31218 Binary relationship form of the Succ function. (Contributed by Scott Fenton, 14-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V       (𝐴Succ𝐵𝐵 = suc 𝐴)

Theoremfunpartlem 31219* Lemma for funpartfun 31220. Show membership in the restriction. (Contributed by Scott Fenton, 4-Dec-2017.)
(𝐴 ∈ dom ((Image𝐹 ∘ Singleton) ∩ (V × Singletons )) ↔ ∃𝑥(𝐹 “ {𝐴}) = {𝑥})

Theoremfunpartfun 31220 The functional part of 𝐹 is a function. (Contributed by Scott Fenton, 16-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Fun Funpart𝐹

Theoremfunpartss 31221 The functional part of 𝐹 is a subset of 𝐹. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Funpart𝐹𝐹

Theoremfunpartfv 31222 The function value of the functional part is identical to the original functional value. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
(Funpart𝐹𝐴) = (𝐹𝐴)

Theoremfullfunfnv 31223 The full functional part of 𝐹 is a function over V. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
FullFun𝐹 Fn V

Theoremfullfunfv 31224 The function value of the full function of 𝐹 agrees with 𝐹. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
(FullFun𝐹𝐴) = (𝐹𝐴)

Theorembrfullfun 31225 A binary relationship form condition for the full function. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V       (𝐴FullFun𝐹𝐵𝐵 = (𝐹𝐴))

Theorembrrestrict 31226 The binary relationship form of the Restrict function. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
𝐴 ∈ V    &   𝐵 ∈ V    &   𝐶 ∈ V       (⟨𝐴, 𝐵⟩Restrict𝐶𝐶 = (𝐴𝐵))

Theoremdfrecs2 31227 A quantifier-free definition of recs. (Contributed by Scott Fenton, 17-Jul-2020.)
recs(𝐹) = (( Funs ∩ (Domain “ On)) ∖ dom (( E ∘ Domain) ∖ Fix (Apply ∘ (FullFun𝐹 ∘ Restrict))))

Theoremdfrdg4 31228 A quantifier-free definition of the recursive definition generator. (Contributed by Scott Fenton, 17-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
rec(𝐹, 𝐴) = (( Funs ∩ (Domain “ On)) ∖ dom (( E ∘ Domain) ∖ Fix (Apply ∘ (((V × {∅}) × { {𝐴}}) ∪ ((( Bigcup ∘ Img) ↾ (V × Limits )) ∪ ((FullFun𝐹 ∘ (Apply ∘ pprod( I , Bigcup ))) ↾ (V × ran Succ)))))))

Theoremdfint3 31229 Quantifier-free definition of class intersection. (Contributed by Scott Fenton, 13-Apr-2018.)
𝐴 = (V ∖ ((V ∖ E ) “ 𝐴))

Theoremimagesset 31230 The Image functor applied to the converse of the subset relationship yields a subset of the subset relationship. (Contributed by Scott Fenton, 14-Apr-2018.)
Image SSet SSet

Theorembrub 31231* Binary relationship form of the upper bound functor. (Contributed by Scott Fenton, 3-May-2018.)
𝑆 ∈ V    &   𝐴 ∈ V       (𝑆UB𝑅𝐴 ↔ ∀𝑥𝑆 𝑥𝑅𝐴)

Theorembrlb 31232* Binary relationship form of the lower bound functor. (Contributed by Scott Fenton, 3-May-2018.)
𝑆 ∈ V    &   𝐴 ∈ V       (𝑆LB𝑅𝐴 ↔ ∀𝑥𝑆 𝐴𝑅𝑥)

21.8.28  Alternate ordered pairs

Syntaxcaltop 31233 Declare the syntax for an alternate ordered pair.
class 𝐴, 𝐵

Syntaxcaltxp 31234 Declare the syntax for an alternate Cartesian product.
class (𝐴 ×× 𝐵)

Definitiondf-altop 31235 An alternative definition of ordered pairs. This definition removes a hypothesis from its defining theorem (see altopth 31246), making it more convenient in some circumstances. (Contributed by Scott Fenton, 22-Mar-2012.)
𝐴, 𝐵⟫ = {{𝐴}, {𝐴, {𝐵}}}

Definitiondf-altxp 31236* Define Cartesian products of alternative ordered pairs. (Contributed by Scott Fenton, 23-Mar-2012.)
(𝐴 ×× 𝐵) = {𝑧 ∣ ∃𝑥𝐴𝑦𝐵 𝑧 = ⟪𝑥, 𝑦⟫}

Theoremaltopex 31237 Alternative ordered pairs always exist. (Contributed by Scott Fenton, 22-Mar-2012.)
𝐴, 𝐵⟫ ∈ V

Theoremaltopthsn 31238 Two alternate ordered pairs are equal iff the singletons of their respective elements are equal. Note that this holds regardless of sethood of any of the elements. (Contributed by Scott Fenton, 16-Apr-2012.)
(⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ ({𝐴} = {𝐶} ∧ {𝐵} = {𝐷}))

Theoremaltopeq12 31239 Equality for alternate ordered pairs. (Contributed by Scott Fenton, 22-Mar-2012.)
((𝐴 = 𝐵𝐶 = 𝐷) → ⟪𝐴, 𝐶⟫ = ⟪𝐵, 𝐷⟫)

Theoremaltopeq1 31240 Equality for alternate ordered pairs. (Contributed by Scott Fenton, 22-Mar-2012.)
(𝐴 = 𝐵 → ⟪𝐴, 𝐶⟫ = ⟪𝐵, 𝐶⟫)

Theoremaltopeq2 31241 Equality for alternate ordered pairs. (Contributed by Scott Fenton, 22-Mar-2012.)
(𝐴 = 𝐵 → ⟪𝐶, 𝐴⟫ = ⟪𝐶, 𝐵⟫)

Theoremaltopth1 31242 Equality of the first members of equal alternate ordered pairs, which holds regardless of the second members' sethood. (Contributed by Scott Fenton, 22-Mar-2012.)
(𝐴𝑉 → (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ → 𝐴 = 𝐶))

Theoremaltopth2 31243 Equality of the second members of equal alternate ordered pairs, which holds regardless of the first members' sethood. (Contributed by Scott Fenton, 22-Mar-2012.)
(𝐵𝑉 → (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ → 𝐵 = 𝐷))

Theoremaltopthg 31244 Alternate ordered pair theorem. (Contributed by Scott Fenton, 22-Mar-2012.)
((𝐴𝑉𝐵𝑊) → (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷)))

Theoremaltopthbg 31245 Alternate ordered pair theorem. (Contributed by Scott Fenton, 14-Apr-2012.)
((𝐴𝑉𝐷𝑊) → (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷)))

Theoremaltopth 31246 The alternate ordered pair theorem. If two alternate ordered pairs are equal, their first elements are equal and their second elements are equal. Note that 𝐶 and 𝐷 are not required to be a set due to a peculiarity of our specific ordered pair definition, as opposed to the regular ordered pairs used here, which (as in opth 4871), requires 𝐷 to be a set. (Contributed by Scott Fenton, 23-Mar-2012.)
𝐴 ∈ V    &   𝐵 ∈ V       (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷))

Theoremaltopthb 31247 Alternate ordered pair theorem with different sethood requirements. See altopth 31246 for more comments. (Contributed by Scott Fenton, 14-Apr-2012.)
𝐴 ∈ V    &   𝐷 ∈ V       (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷))

Theoremaltopthc 31248 Alternate ordered pair theorem with different sethood requirements. See altopth 31246 for more comments. (Contributed by Scott Fenton, 14-Apr-2012.)
𝐵 ∈ V    &   𝐶 ∈ V       (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷))

Theoremaltopthd 31249 Alternate ordered pair theorem with different sethood requirements. See altopth 31246 for more comments. (Contributed by Scott Fenton, 14-Apr-2012.)
𝐶 ∈ V    &   𝐷 ∈ V       (⟪𝐴, 𝐵⟫ = ⟪𝐶, 𝐷⟫ ↔ (𝐴 = 𝐶𝐵 = 𝐷))

Theoremaltxpeq1 31250 Equality for alternate Cartesian products. (Contributed by Scott Fenton, 24-Mar-2012.)
(𝐴 = 𝐵 → (𝐴 ×× 𝐶) = (𝐵 ×× 𝐶))

Theoremaltxpeq2 31251 Equality for alternate Cartesian products. (Contributed by Scott Fenton, 24-Mar-2012.)
(𝐴 = 𝐵 → (𝐶 ×× 𝐴) = (𝐶 ×× 𝐵))

Theoremelaltxp 31252* Membership in alternate Cartesian products. (Contributed by Scott Fenton, 23-Mar-2012.)
(𝑋 ∈ (𝐴 ×× 𝐵) ↔ ∃𝑥𝐴𝑦𝐵 𝑋 = ⟪𝑥, 𝑦⟫)

Theoremaltopelaltxp 31253 Alternate ordered pair membership in a Cartesian product. Note that, unlike opelxp 5070, there is no sethood requirement here. (Contributed by Scott Fenton, 22-Mar-2012.)
(⟪𝑋, 𝑌⟫ ∈ (𝐴 ×× 𝐵) ↔ (𝑋𝐴𝑌𝐵))

Theoremaltxpsspw 31254 An inclusion rule for alternate Cartesian products. (Contributed by Scott Fenton, 24-Mar-2012.)
(𝐴 ×× 𝐵) ⊆ 𝒫 𝒫 (𝐴 ∪ 𝒫 𝐵)

Theoremaltxpexg 31255 The alternate Cartesian product of two sets is a set. (Contributed by Scott Fenton, 24-Mar-2012.)
((𝐴𝑉𝐵𝑊) → (𝐴 ×× 𝐵) ∈ V)

Theoremrankaltopb 31256 Compute the rank of an alternate ordered pair. (Contributed by Scott Fenton, 18-Dec-2013.) (Revised by Mario Carneiro, 19-Apr-2014.)
((𝐴 (𝑅1 “ On) ∧ 𝐵 (𝑅1 “ On)) → (rank‘⟪𝐴, 𝐵⟫) = suc suc ((rank‘𝐴) ∪ suc (rank‘𝐵)))

Theoremnfaltop 31257 Bound-variable hypothesis builder for alternate ordered pairs. (Contributed by Scott Fenton, 25-Sep-2015.)
𝑥𝐴    &   𝑥𝐵       𝑥𝐴, 𝐵

Theoremsbcaltop 31258* Distribution of class substitution over alternate ordered pairs. (Contributed by Scott Fenton, 25-Sep-2015.)
(𝐴 ∈ V → 𝐴 / 𝑥𝐶, 𝐷⟫ = ⟪𝐴 / 𝑥𝐶, 𝐴 / 𝑥𝐷⟫)

21.8.29  Geometry in the Euclidean space

21.8.29.1  Congruence properties

Syntaxcofs 31259 Declare the syntax for the outer five segment configuration.
class OuterFiveSeg

Definitiondf-ofs 31260* The outer five segment configuration is an abbreviation for the conditions of the Five Segment Axiom (ax5seg 25618). See brofs 31282 and 5segofs 31283 for how it is used. Definition 2.10 of [Schwabhauser] p. 28. (Contributed by Scott Fenton, 21-Sep-2013.)
OuterFiveSeg = {⟨𝑝, 𝑞⟩ ∣ ∃𝑛 ∈ ℕ ∃𝑎 ∈ (𝔼‘𝑛)∃𝑏 ∈ (𝔼‘𝑛)∃𝑐 ∈ (𝔼‘𝑛)∃𝑑 ∈ (𝔼‘𝑛)∃𝑥 ∈ (𝔼‘𝑛)∃𝑦 ∈ (𝔼‘𝑛)∃𝑧 ∈ (𝔼‘𝑛)∃𝑤 ∈ (𝔼‘𝑛)(𝑝 = ⟨⟨𝑎, 𝑏⟩, ⟨𝑐, 𝑑⟩⟩ ∧ 𝑞 = ⟨⟨𝑥, 𝑦⟩, ⟨𝑧, 𝑤⟩⟩ ∧ ((𝑏 Btwn ⟨𝑎, 𝑐⟩ ∧ 𝑦 Btwn ⟨𝑥, 𝑧⟩) ∧ (⟨𝑎, 𝑏⟩Cgr⟨𝑥, 𝑦⟩ ∧ ⟨𝑏, 𝑐⟩Cgr⟨𝑦, 𝑧⟩) ∧ (⟨𝑎, 𝑑⟩Cgr⟨𝑥, 𝑤⟩ ∧ ⟨𝑏, 𝑑⟩Cgr⟨𝑦, 𝑤⟩)))}

Theoremcgrrflx2d 31261 Deduction form of axcgrrflx 25594. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))       (𝜑 → ⟨𝐴, 𝐵⟩Cgr⟨𝐵, 𝐴⟩)

Theoremcgrtr4d 31262 Deduction form of axcgrtr 25595. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   (𝜑𝐸 ∈ (𝔼‘𝑁))    &   (𝜑𝐹 ∈ (𝔼‘𝑁))    &   (𝜑 → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)    &   (𝜑 → ⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩)       (𝜑 → ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩)

Theoremcgrtr4and 31263 Deduction form of axcgrtr 25595. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   (𝜑𝐸 ∈ (𝔼‘𝑁))    &   (𝜑𝐹 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩)       ((𝜑𝜓) → ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩)

Theoremcgrrflx 31264 Reflexivity law for congruence. Theorem 2.1 of [Schwabhauser] p. 27. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐵⟩)

Theoremcgrrflxd 31265 Deduction form of cgrrflx 31264. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))       (𝜑 → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐵⟩)

Theoremcgrcomim 31266 Congruence commutes on the two sides. Implication version. Theorem 2.2 of [Schwabhauser] p. 27. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ → ⟨𝐶, 𝐷⟩Cgr⟨𝐴, 𝐵⟩))

Theoremcgrcom 31267 Congruence commutes between the two sides. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ ↔ ⟨𝐶, 𝐷⟩Cgr⟨𝐴, 𝐵⟩))

Theoremcgrcomand 31268 Deduction form of cgrcom 31267. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)       ((𝜑𝜓) → ⟨𝐶, 𝐷⟩Cgr⟨𝐴, 𝐵⟩)

Theoremcgrtr 31269 Transitivity law for congruence. Theorem 2.3 of [Schwabhauser] p. 27. (Contributed by Scott Fenton, 24-Sep-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁) ∧ 𝐹 ∈ (𝔼‘𝑁))) → ((⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ ∧ ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩) → ⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩))

Theoremcgrtrand 31270 Deduction form of cgrtr 31269. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   (𝜑𝐸 ∈ (𝔼‘𝑁))    &   (𝜑𝐹 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)    &   ((𝜑𝜓) → ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩)       ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩)

Theoremcgrtr3 31271 Transitivity law for congruence. (Contributed by Scott Fenton, 7-Oct-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁) ∧ 𝐹 ∈ (𝔼‘𝑁))) → ((⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩ ∧ ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩))

Theoremcgrtr3and 31272 Deduction form of cgrtr3 31271. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   (𝜑𝐸 ∈ (𝔼‘𝑁))    &   (𝜑𝐹 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩)    &   ((𝜑𝜓) → ⟨𝐶, 𝐷⟩Cgr⟨𝐸, 𝐹⟩)       ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)

Theoremcgrcoml 31273 Congruence commutes on the left. Biconditional version of Theorem 2.4 of [Schwabhauser] p. 27. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ ↔ ⟨𝐵, 𝐴⟩Cgr⟨𝐶, 𝐷⟩))

Theoremcgrcomr 31274 Congruence commutes on the right. Biconditional version of Theorem 2.5 of [Schwabhauser] p. 27. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ ↔ ⟨𝐴, 𝐵⟩Cgr⟨𝐷, 𝐶⟩))

Theoremcgrcomlr 31275 Congruence commutes on both sides. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ ↔ ⟨𝐵, 𝐴⟩Cgr⟨𝐷, 𝐶⟩))

Theoremcgrcomland 31276 Deduction form of cgrcoml 31273. (Contributed by Scott Fenton, 14-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)       ((𝜑𝜓) → ⟨𝐵, 𝐴⟩Cgr⟨𝐶, 𝐷⟩)

Theoremcgrcomrand 31277 Deduction form of cgrcoml 31273. (Contributed by Scott Fenton, 14-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)       ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐷, 𝐶⟩)

Theoremcgrcomlrand 31278 Deduction form of cgrcomlr 31275. (Contributed by Scott Fenton, 14-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩)       ((𝜑𝜓) → ⟨𝐵, 𝐴⟩Cgr⟨𝐷, 𝐶⟩)

Theoremcgrtriv 31279 Degenerate segments are congruent. Theorem 2.8 of [Schwabhauser] p. 28. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → ⟨𝐴, 𝐴⟩Cgr⟨𝐵, 𝐵⟩)

Theoremcgrid2 31280 Identity law for congruence. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐴⟩Cgr⟨𝐵, 𝐶⟩ → 𝐵 = 𝐶))

Theoremcgrdegen 31281 Two congruent segments are either both degenrate or both non-degenerate. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → (⟨𝐴, 𝐵⟩Cgr⟨𝐶, 𝐷⟩ → (𝐴 = 𝐵𝐶 = 𝐷)))

Theorembrofs 31282 Binary relationship form of the outer five segment predicate. (Contributed by Scott Fenton, 21-Sep-2013.)
(((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁)) ∧ (𝐹 ∈ (𝔼‘𝑁) ∧ 𝐺 ∈ (𝔼‘𝑁) ∧ 𝐻 ∈ (𝔼‘𝑁))) → (⟨⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩⟩ OuterFiveSeg ⟨⟨𝐸, 𝐹⟩, ⟨𝐺, 𝐻⟩⟩ ↔ ((𝐵 Btwn ⟨𝐴, 𝐶⟩ ∧ 𝐹 Btwn ⟨𝐸, 𝐺⟩) ∧ (⟨𝐴, 𝐵⟩Cgr⟨𝐸, 𝐹⟩ ∧ ⟨𝐵, 𝐶⟩Cgr⟨𝐹, 𝐺⟩) ∧ (⟨𝐴, 𝐷⟩Cgr⟨𝐸, 𝐻⟩ ∧ ⟨𝐵, 𝐷⟩Cgr⟨𝐹, 𝐻⟩))))

Theorem5segofs 31283 Rephrase ax5seg 25618 using the outer five segment predicate. Theorem 2.10 of [Schwabhauser] p. 28. (Contributed by Scott Fenton, 21-Sep-2013.)
(((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁)) ∧ (𝐹 ∈ (𝔼‘𝑁) ∧ 𝐺 ∈ (𝔼‘𝑁) ∧ 𝐻 ∈ (𝔼‘𝑁))) → ((⟨⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩⟩ OuterFiveSeg ⟨⟨𝐸, 𝐹⟩, ⟨𝐺, 𝐻⟩⟩ ∧ 𝐴𝐵) → ⟨𝐶, 𝐷⟩Cgr⟨𝐺, 𝐻⟩))

Theoremofscom 31284 The outer five segment predicate commutes. (Contributed by Scott Fenton, 26-Sep-2013.)
(((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁)) ∧ (𝐹 ∈ (𝔼‘𝑁) ∧ 𝐺 ∈ (𝔼‘𝑁) ∧ 𝐻 ∈ (𝔼‘𝑁))) → (⟨⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩⟩ OuterFiveSeg ⟨⟨𝐸, 𝐹⟩, ⟨𝐺, 𝐻⟩⟩ ↔ ⟨⟨𝐸, 𝐹⟩, ⟨𝐺, 𝐻⟩⟩ OuterFiveSeg ⟨⟨𝐴, 𝐵⟩, ⟨𝐶, 𝐷⟩⟩))

Theoremcgrextend 31285 Link congruence over a pair of line segments. Theorem 2.11 of [Schwabhauser] p. 29. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝐷 ∈ (𝔼‘𝑁) ∧ 𝐸 ∈ (𝔼‘𝑁) ∧ 𝐹 ∈ (𝔼‘𝑁))) → (((𝐵 Btwn ⟨𝐴, 𝐶⟩ ∧ 𝐸 Btwn ⟨𝐷, 𝐹⟩) ∧ (⟨𝐴, 𝐵⟩Cgr⟨𝐷, 𝐸⟩ ∧ ⟨𝐵, 𝐶⟩Cgr⟨𝐸, 𝐹⟩)) → ⟨𝐴, 𝐶⟩Cgr⟨𝐷, 𝐹⟩))

Theoremcgrextendand 31286 Deduction form of cgrextend 31285. (Contributed by Scott Fenton, 14-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   (𝜑𝐸 ∈ (𝔼‘𝑁))    &   (𝜑𝐹 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)    &   ((𝜑𝜓) → 𝐸 Btwn ⟨𝐷, 𝐹⟩)    &   ((𝜑𝜓) → ⟨𝐴, 𝐵⟩Cgr⟨𝐷, 𝐸⟩)    &   ((𝜑𝜓) → ⟨𝐵, 𝐶⟩Cgr⟨𝐸, 𝐹⟩)       ((𝜑𝜓) → ⟨𝐴, 𝐶⟩Cgr⟨𝐷, 𝐹⟩)

Theoremsegconeq 31287 Two points that satsify the conclusion of axsegcon 25607 are identical. Uniqueness portion of Theorem 2.12 of [Schwabhauser] p. 29. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑄 ∈ (𝔼‘𝑁) ∧ 𝑋 ∈ (𝔼‘𝑁) ∧ 𝑌 ∈ (𝔼‘𝑁))) → ((𝑄𝐴 ∧ (𝐴 Btwn ⟨𝑄, 𝑋⟩ ∧ ⟨𝐴, 𝑋⟩Cgr⟨𝐵, 𝐶⟩) ∧ (𝐴 Btwn ⟨𝑄, 𝑌⟩ ∧ ⟨𝐴, 𝑌⟩Cgr⟨𝐵, 𝐶⟩)) → 𝑋 = 𝑌))

Theoremsegconeu 31288* Existential uniqueness version of segconeq 31287. (Contributed by Scott Fenton, 19-Oct-2013.) (Revised by Mario Carneiro, 19-Apr-2014.)
((𝑁 ∈ ℕ ∧ ((𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁)) ∧ 𝐶𝐷)) → ∃!𝑟 ∈ (𝔼‘𝑁)(𝐷 Btwn ⟨𝐶, 𝑟⟩ ∧ ⟨𝐷, 𝑟⟩Cgr⟨𝐴, 𝐵⟩))

21.8.29.2  Betweenness properties

Theorembtwntriv2 31289 Betweenness always holds for the second endpoint. Theorem 3.1 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → 𝐵 Btwn ⟨𝐴, 𝐵⟩)

Theorembtwncomim 31290 Betweenness commutes. Implication version. Theorem 3.2 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐵, 𝐶⟩ → 𝐴 Btwn ⟨𝐶, 𝐵⟩))

Theorembtwncom 31291 Betweenness commutes. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐵, 𝐶⟩ ↔ 𝐴 Btwn ⟨𝐶, 𝐵⟩))

Theorembtwncomand 31292 Deduction form of btwncom 31291. (Contributed by Scott Fenton, 14-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → 𝐴 Btwn ⟨𝐵, 𝐶⟩)       ((𝜑𝜓) → 𝐴 Btwn ⟨𝐶, 𝐵⟩)

Theorembtwntriv1 31293 Betweenness always holds for the first endpoint. Theorem 3.3 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → 𝐴 Btwn ⟨𝐴, 𝐵⟩)

Theorembtwnswapid 31294 If you can swap the first two arguments of a betweenness statement, then those arguments are identical. Theorem 3.4 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ 𝐵 Btwn ⟨𝐴, 𝐶⟩) → 𝐴 = 𝐵))

Theorembtwnswapid2 31295 If you can swap arguments one and three of a betweenness statement, then those arguments are identical. (Contributed by Scott Fenton, 7-Oct-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ 𝐶 Btwn ⟨𝐵, 𝐴⟩) → 𝐴 = 𝐶))

Theorembtwnintr 31296 Inner transitivity law for betweenness. Left-hand side of Theorem 3.5 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → ((𝐵 Btwn ⟨𝐴, 𝐷⟩ ∧ 𝐶 Btwn ⟨𝐵, 𝐷⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩))

Theorembtwnexch3 31297 Exchange the first endpoint in betweenness. Left-hand side of Theorem 3.6 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → ((𝐵 Btwn ⟨𝐴, 𝐶⟩ ∧ 𝐶 Btwn ⟨𝐴, 𝐷⟩) → 𝐶 Btwn ⟨𝐵, 𝐷⟩))

Theorembtwnexch3and 31298 Deduction form of btwnexch3 31297. (Contributed by Scott Fenton, 13-Oct-2013.)
(𝜑𝑁 ∈ ℕ)    &   (𝜑𝐴 ∈ (𝔼‘𝑁))    &   (𝜑𝐵 ∈ (𝔼‘𝑁))    &   (𝜑𝐶 ∈ (𝔼‘𝑁))    &   (𝜑𝐷 ∈ (𝔼‘𝑁))    &   ((𝜑𝜓) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)    &   ((𝜑𝜓) → 𝐶 Btwn ⟨𝐴, 𝐷⟩)       ((𝜑𝜓) → 𝐶 Btwn ⟨𝐵, 𝐷⟩)

Theorembtwnouttr2 31299 Outer transitivity law for betweenness. Left-hand side of Theorem 3.1 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 12-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → ((𝐵𝐶𝐵 Btwn ⟨𝐴, 𝐶⟩ ∧ 𝐶 Btwn ⟨𝐵, 𝐷⟩) → 𝐶 Btwn ⟨𝐴, 𝐷⟩))

Theorembtwnexch2 31300 Exchange the outer point of two betweenness statements. Right-hand side of Theorem 3.5 of [Schwabhauser] p. 30. (Contributed by Scott Fenton, 14-Jun-2013.)
((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐷 ∈ (𝔼‘𝑁))) → ((𝐵 Btwn ⟨𝐴, 𝐷⟩ ∧ 𝐶 Btwn ⟨𝐵, 𝐷⟩) → 𝐶 Btwn ⟨𝐴, 𝐷⟩))

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