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Theorem fvconstdomi 46075
Description: A constant function's value is dominated by the constant. (An artifact of our function value definition.) (Contributed by Zhi Wang, 18-Sep-2024.)
Hypothesis
Ref Expression
fvconstdomi.1 𝐵 ∈ V
Assertion
Ref Expression
fvconstdomi ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵

Proof of Theorem fvconstdomi
StepHypRef Expression
1 dmxpss 6063 . . . . 5 dom (𝐴 × {𝐵}) ⊆ 𝐴
21sseli 3913 . . . 4 (𝑋 ∈ dom (𝐴 × {𝐵}) → 𝑋𝐴)
3 fvconstdomi.1 . . . . 5 𝐵 ∈ V
43fvconst2 7061 . . . 4 (𝑋𝐴 → ((𝐴 × {𝐵})‘𝑋) = 𝐵)
52, 4syl 17 . . 3 (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = 𝐵)
6 domrefg 8730 . . . 4 (𝐵 ∈ V → 𝐵𝐵)
73, 6ax-mp 5 . . 3 𝐵𝐵
85, 7eqbrtrdi 5109 . 2 (𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵)
9 ndmfv 6786 . . 3 𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) = ∅)
1030dom 8843 . . 3 ∅ ≼ 𝐵
119, 10eqbrtrdi 5109 . 2 𝑋 ∈ dom (𝐴 × {𝐵}) → ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵)
128, 11pm2.61i 182 1 ((𝐴 × {𝐵})‘𝑋) ≼ 𝐵
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3   = wceq 1539  wcel 2108  Vcvv 3422  c0 4253  {csn 4558   class class class wbr 5070   × cxp 5578  dom cdm 5580  cfv 6418  cdom 8689
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-en 8692  df-dom 8693
This theorem is referenced by:  f1omoALT  46077
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