Theorem ineq1i 3422

Description: Equality inference for intersection of two classes. (Contributed by NM, 26-Dec-1993.)

Hypothesis

Ref	Expression
ineq1i.1	⊢ 𝐴 = 𝐵

Assertion

Ref	Expression
ineq1i	⊢ (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶)

Proof of Theorem ineq1i

Step	Hyp	Ref	Expression
1		ineq1i.1	. 2 ⊢ 𝐴 = 𝐵
2		ineq1 3419	. 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶))
3	1, 2	ax-mp 5	1 ⊢ (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶)

Syntax hints:   = wceq 1398   ∩ cin 3213

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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-v 2817  df-in 3220

This theorem is referenced by:  in12  3436  inindi  3442  dfrab2  3500  dfrab3  3501  disjpr2  3758  resres  5055  imainrect  5213  ssenen  7118  minmax  11940  xrminmax  11975  nnmindc  12755  nnminle  12756  ballotfilem2  13172  ballotfilemfval0  13179  setsfun  13331  setsfun0  13332  ressressg  13372  tgrest  15160