Theorem mpteq12dv 4171

Description: An equality inference for the maps-to notation. (Contributed by NM, 24-Aug-2011.) (Revised by Mario Carneiro, 16-Dec-2013.)

Hypotheses

Ref	Expression
mpteq12dv.1	⊢ (𝜑 → 𝐴 = 𝐶)
mpteq12dv.2	⊢ (𝜑 → 𝐵 = 𝐷)

Assertion

Ref	Expression
mpteq12dv	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐶 ↦ 𝐷))

Distinct variable group:   𝜑,𝑥

Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑥)   𝐶(𝑥)   𝐷(𝑥)

Proof of Theorem mpteq12dv

Step	Hyp	Ref	Expression
1		mpteq12dv.1	. 2 ⊢ (𝜑 → 𝐴 = 𝐶)
2		mpteq12dv.2	. . 3 ⊢ (𝜑 → 𝐵 = 𝐷)
3	2	adantr 276	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 = 𝐷)
4	1, 3	mpteq12dva 4170	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐶 ↦ 𝐷))

Syntax hints:   → wi 4   = wceq 1397   ∈ wcel 2202   ↦ cmpt 4150

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-11 1554  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-ral 2515  df-opab 4151  df-mpt 4152

This theorem is referenced by:  mpteq12i  4177  offval  6243  offval3  6296  ccatfvalfi  11173  swrdval  11233  odzval  12819  restval  13333  prdsex  13357  prdsval  13361  qusval  13411  grpinvfvalg  13630  grpinvpropdg  13663  opprnegg  14102  lspfval  14408  lsppropd  14452  sraval  14457  psrval  14686  ntrfval  14830  clsfval  14831  neifval  14870  cnpfval  14925  cnprcl2k  14936  reldvg  15409  dvfvalap  15411  eldvap  15412  vtxdgfval  16145  vtxdgop  16149  vtxdeqd  16153