Theorem mpompt 7522

Description: Express a two-argument function as a one-argument function, or vice-versa. (Contributed by Mario Carneiro, 17-Dec-2013.) (Revised by Mario Carneiro, 29-Dec-2014.)

Hypothesis

Ref	Expression
mpompt.1	⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → 𝐶 = 𝐷)

Assertion

Ref	Expression
mpompt	⊢ (𝑧 ∈ (𝐴 × 𝐵) ↦ 𝐶) = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐷)

Distinct variable groups:   𝑥,𝑦,𝑧,𝐴   𝑦,𝐵,𝑧   𝑥,𝐶,𝑦   𝑧,𝐷   𝑥,𝐵

Allowed substitution hints:   𝐶(𝑧)   𝐷(𝑥,𝑦)

Proof of Theorem mpompt

Step	Hyp	Ref	Expression
1		iunxpconst 5749	. . 3 ⊢ ∪ 𝑥 ∈ 𝐴 ({𝑥} × 𝐵) = (𝐴 × 𝐵)
2	1	mpteq1i 5245	. 2 ⊢ (𝑧 ∈ ∪ 𝑥 ∈ 𝐴 ({𝑥} × 𝐵) ↦ 𝐶) = (𝑧 ∈ (𝐴 × 𝐵) ↦ 𝐶)
3		mpompt.1	. . 3 ⊢ (𝑧 = ⟨𝑥, 𝑦⟩ → 𝐶 = 𝐷)
4	3	mpomptx 7521	. 2 ⊢ (𝑧 ∈ ∪ 𝑥 ∈ 𝐴 ({𝑥} × 𝐵) ↦ 𝐶) = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐷)
5	2, 4	eqtr3i 2763	1 ⊢ (𝑧 ∈ (𝐴 × 𝐵) ↦ 𝐶) = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐷)

Syntax hints:   → wi 4   = wceq 1542  {csn 4629  ⟨cop 4635  ∪ ciun 4998   ↦ cmpt 5232   × cxp 5675   ∈ cmpo 7411

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5300  ax-nul 5307  ax-pr 5428

This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ral 3063  df-rex 3072  df-rab 3434  df-v 3477  df-sbc 3779  df-csb 3895  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-iun 5000  df-opab 5212  df-mpt 5233  df-xp 5683  df-rel 5684  df-oprab 7413  df-mpo 7414

This theorem is referenced by:  fconstmpo  7525  fnov  7540  fmpoco  8081  fimaproj  8121  xpf1o  9139  resfval2  17843  catcisolem  18060  xpccatid  18140  curf2ndf  18200  evlslem4  21637  mdetunilem9  22122  txbas  23071  cnmpt1st  23172  cnmpt2nd  23173  cnmpt2c  23174  cnmpt2t  23177  txhmeo  23307  txswaphmeolem  23308  ptuncnv  23311  ptunhmeo  23312  xpstopnlem1  23313  xkohmeo  23319  prdstmdd  23628  ucnimalem  23785  fmucndlem  23796  fsum2cn  24387  curfv  36468  aks6d1c2p1  40956  fmpocos  41056  idfusubc0  46639  lmod1zr  47174  2arymaptf  47338