Theorem mpteq12dv 4191

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 4190	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐶 ↦ 𝐷))

Syntax hints:   → wi 4   = wceq 1398   ∈ wcel 2203   ↦ cmpt 4170

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 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-ral 2525  df-opab 4171  df-mpt 4172

This theorem is referenced by:  mpteq12i  4197  offval  6273  offval3  6326  ccatfvalfi  11276  swrdval  11336  odzval  12935  restval  13450  prdsex  13474  prdsval  13478  qusval  13528  grpinvfvalg  13747  grpinvpropdg  13780  opprnegg  14219  lspfval  14528  lsppropd  14572  sraval  14577  psrval  14806  ntrfval  14957  clsfval  14958  neifval  14997  cnpfval  15052  cnprcl2k  15063  reldvg  15536  dvfvalap  15538  eldvap  15539  vtxdgfval  16275  vtxdgop  16279  vtxdeqd  16283