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Theorem mapsnconst 7789
Description: Every singleton map is a constant function. (Contributed by Stefan O'Rear, 25-Mar-2015.)
Hypotheses
Ref Expression
mapsncnv.s 𝑆 = {𝑋}
mapsncnv.b 𝐵 ∈ V
mapsncnv.x 𝑋 ∈ V
Assertion
Ref Expression
mapsnconst (𝐹 ∈ (𝐵𝑚 𝑆) → 𝐹 = (𝑆 × {(𝐹𝑋)}))

Proof of Theorem mapsnconst
StepHypRef Expression
1 mapsncnv.b . . . 4 𝐵 ∈ V
2 snex 4835 . . . 4 {𝑋} ∈ V
31, 2elmap 7772 . . 3 (𝐹 ∈ (𝐵𝑚 {𝑋}) ↔ 𝐹:{𝑋}⟶𝐵)
4 mapsncnv.x . . . . . 6 𝑋 ∈ V
54fsn2 6309 . . . . 5 (𝐹:{𝑋}⟶𝐵 ↔ ((𝐹𝑋) ∈ 𝐵𝐹 = {⟨𝑋, (𝐹𝑋)⟩}))
65simprbi 479 . . . 4 (𝐹:{𝑋}⟶𝐵𝐹 = {⟨𝑋, (𝐹𝑋)⟩})
7 mapsncnv.s . . . . . 6 𝑆 = {𝑋}
87xpeq1i 5059 . . . . 5 (𝑆 × {(𝐹𝑋)}) = ({𝑋} × {(𝐹𝑋)})
9 fvex 6113 . . . . . 6 (𝐹𝑋) ∈ V
104, 9xpsn 6313 . . . . 5 ({𝑋} × {(𝐹𝑋)}) = {⟨𝑋, (𝐹𝑋)⟩}
118, 10eqtr2i 2633 . . . 4 {⟨𝑋, (𝐹𝑋)⟩} = (𝑆 × {(𝐹𝑋)})
126, 11syl6eq 2660 . . 3 (𝐹:{𝑋}⟶𝐵𝐹 = (𝑆 × {(𝐹𝑋)}))
133, 12sylbi 206 . 2 (𝐹 ∈ (𝐵𝑚 {𝑋}) → 𝐹 = (𝑆 × {(𝐹𝑋)}))
147oveq2i 6560 . 2 (𝐵𝑚 𝑆) = (𝐵𝑚 {𝑋})
1513, 14eleq2s 2706 1 (𝐹 ∈ (𝐵𝑚 𝑆) → 𝐹 = (𝑆 × {(𝐹𝑋)}))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1475  wcel 1977  Vcvv 3173  {csn 4125  cop 4131   × cxp 5036  wf 5800  cfv 5804  (class class class)co 6549  𝑚 cmap 7744
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-8 1979  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-pow 4769  ax-pr 4833  ax-un 6847
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-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  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-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-map 7746
This theorem is referenced by:  mapsncnv  7790  fvcoe1  19398  coe1mul2lem1  19458  coe1mul2  19460
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