Theorem unieqi 3806

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	|- U. A = U. B

Proof of Theorem unieqi

Step	Hyp	Ref	Expression
1		unieqi.1	. 2 |- A = B
2		unieq 3805	. 2 |- ( A = B -> U. A = U. B )
3	1, 2	ax-mp 5	1 |- U. A = U. B

Syntax hints:   = wceq 1348   U.cuni 3796

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rex 2454  df-uni 3797

This theorem is referenced by:  elunirab  3809  unisn  3812  uniop  4240  unisuc  4398  unisucg  4399  univ  4461  dfiun3g  4868  op1sta  5092  op2nda  5095  dfdm2  5145  iotajust  5159  dfiota2  5161  cbviota  5165  sb8iota  5167  dffv4g  5493  funfvdm2f  5561  riotauni  5815  1st0  6123  2nd0  6124  unielxp  6153  brtpos0  6231  recsfval  6294  uniqs  6571  xpassen  6808  sup00  6980  suplocexprlemell  7675  uptx  13068