Theorem mpteq2dva 3936

Description: Slightly more general equality inference for the maps-to notation. (Contributed by Scott Fenton, 25-Apr-2012.)

Hypothesis

Ref	Expression
mpteq2dva.1	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 = 𝐶)

Assertion

Ref	Expression
mpteq2dva	⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶))

Distinct variable group:   𝜑,𝑥

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

Proof of Theorem mpteq2dva

Step	Hyp	Ref	Expression
1		nfv 1467	. 2 ⊢ Ⅎ𝑥𝜑
2		mpteq2dva.1	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 = 𝐶)
3	1, 2	mpteq2da 3935	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶))

Syntax hints:   → wi 4   ∧ wa 103   = wceq 1290   ∈ wcel 1439   ↦ cmpt 3907

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1382  ax-7 1383  ax-gen 1384  ax-ie1 1428  ax-ie2 1429  ax-8 1441  ax-11 1443  ax-4 1446  ax-17 1465  ax-i9 1469  ax-ial 1473  ax-i5r 1474  ax-ext 2071

This theorem depends on definitions:  df-bi 116  df-tru 1293  df-nf 1396  df-sb 1694  df-clab 2076  df-cleq 2082  df-clel 2085  df-ral 2365  df-opab 3908  df-mpt 3909

This theorem is referenced by:  mpteq2dv  3937  fmptapd  5504  offval  5879  offval2  5886  caofinvl  5893  caofcom  5894  freceq1  6173  freceq2  6174  mapxpen  6620  xpmapenlem  6621  fser0const  10014  sumeq1  10807  sumeq2  10811  restid2  11724  divccncfap  11950