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Mirrors > Home > MPE Home > Th. List > rusgranumwlklem2 | Structured version Visualization version GIF version |
Description: Lemma 2 for rusgranumwlk 26484. (Contributed by Alexander van der Vekens, 21-Jul-2018.) |
Ref | Expression |
---|---|
rusgranumwlk.w | ⊢ 𝑊 = (𝑛 ∈ ℕ0 ↦ {𝑐 ∈ (𝑉 Walks 𝐸) ∣ (#‘(1st ‘𝑐)) = 𝑛}) |
rusgranumwlk.l | ⊢ 𝐿 = (𝑣 ∈ 𝑉, 𝑛 ∈ ℕ0 ↦ (#‘{𝑤 ∈ (𝑊‘𝑛) ∣ ((2nd ‘𝑤)‘0) = 𝑣})) |
Ref | Expression |
---|---|
rusgranumwlklem2 | ⊢ ((𝑃 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑃𝐿𝑁) = (#‘{𝑤 ∈ (𝑊‘𝑁) ∣ ((2nd ‘𝑤)‘0) = 𝑃})) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fveq2 6103 | . . . . 5 ⊢ (𝑛 = 𝑁 → (𝑊‘𝑛) = (𝑊‘𝑁)) | |
2 | 1 | adantl 481 | . . . 4 ⊢ ((𝑣 = 𝑃 ∧ 𝑛 = 𝑁) → (𝑊‘𝑛) = (𝑊‘𝑁)) |
3 | eqeq2 2621 | . . . . 5 ⊢ (𝑣 = 𝑃 → (((2nd ‘𝑤)‘0) = 𝑣 ↔ ((2nd ‘𝑤)‘0) = 𝑃)) | |
4 | 3 | adantr 480 | . . . 4 ⊢ ((𝑣 = 𝑃 ∧ 𝑛 = 𝑁) → (((2nd ‘𝑤)‘0) = 𝑣 ↔ ((2nd ‘𝑤)‘0) = 𝑃)) |
5 | 2, 4 | rabeqbidv 3168 | . . 3 ⊢ ((𝑣 = 𝑃 ∧ 𝑛 = 𝑁) → {𝑤 ∈ (𝑊‘𝑛) ∣ ((2nd ‘𝑤)‘0) = 𝑣} = {𝑤 ∈ (𝑊‘𝑁) ∣ ((2nd ‘𝑤)‘0) = 𝑃}) |
6 | 5 | fveq2d 6107 | . 2 ⊢ ((𝑣 = 𝑃 ∧ 𝑛 = 𝑁) → (#‘{𝑤 ∈ (𝑊‘𝑛) ∣ ((2nd ‘𝑤)‘0) = 𝑣}) = (#‘{𝑤 ∈ (𝑊‘𝑁) ∣ ((2nd ‘𝑤)‘0) = 𝑃})) |
7 | rusgranumwlk.l | . 2 ⊢ 𝐿 = (𝑣 ∈ 𝑉, 𝑛 ∈ ℕ0 ↦ (#‘{𝑤 ∈ (𝑊‘𝑛) ∣ ((2nd ‘𝑤)‘0) = 𝑣})) | |
8 | fvex 6113 | . 2 ⊢ (#‘{𝑤 ∈ (𝑊‘𝑁) ∣ ((2nd ‘𝑤)‘0) = 𝑃}) ∈ V | |
9 | 6, 7, 8 | ovmpt2a 6689 | 1 ⊢ ((𝑃 ∈ 𝑉 ∧ 𝑁 ∈ ℕ0) → (𝑃𝐿𝑁) = (#‘{𝑤 ∈ (𝑊‘𝑁) ∣ ((2nd ‘𝑤)‘0) = 𝑃})) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ∈ wcel 1977 {crab 2900 ↦ cmpt 4643 ‘cfv 5804 (class class class)co 6549 ↦ cmpt2 6551 1st c1st 7057 2nd c2nd 7058 0cc0 9815 ℕ0cn0 11169 #chash 12979 Walks cwalk 26026 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-iota 5768 df-fun 5806 df-fv 5812 df-ov 6552 df-oprab 6553 df-mpt2 6554 |
This theorem is referenced by: rusgranumwlklem3 26478 |
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