Theorem unieqi 3945

Description: Inference of equality of two class unions. (Contributed by NM, 30-Aug-1993.)

Hypothesis

Ref	Expression
unieqi.1	⊢ 𝐴 = 𝐵

Assertion

Ref	Expression
unieqi	⊢ ∪ 𝐴 = ∪ 𝐵

Proof of Theorem unieqi

Step	Hyp	Ref	Expression
1		unieqi.1	. 2 ⊢ 𝐴 = 𝐵
2		unieq 3944	. 2 ⊢ (𝐴 = 𝐵 → ∪ 𝐴 = ∪ 𝐵)
3	1, 2	ax-mp 5	1 ⊢ ∪ 𝐴 = ∪ 𝐵

This proof depends on syntax axioms:   = wceq 1402  ∪ cuni 3935

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-rex 2534  df-uni 3936

This theorem is used by:  elunirab  3948  unisn  3951  uniop  4396  unisuc  4558  unisucg  4559  univ  4622  dfiun3g  5039  op1sta  5269  op2nda  5272  dfdm2  5322  iotajust  5336  dfiota2  5338  cbviota  5342  cbviotavw  5343  sb8iota  5345  dffv4g  5692  funfvdm2f  5768  riotauni  6045  1st0  6378  2nd0  6379  unielxp  6408  brtpos0  6523  recsfval  6586  uniqs  6867  xpassen  7128  sup00  7343  suplocexprlemell  8080  uptx  15375