Theorem ineq1i 3369

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 3366	. 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶))
3	1, 2	ax-mp 5	1 ⊢ (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶)

Syntax hints:   = wceq 1372   ∩ cin 3164

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 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-ext 2186

This theorem depends on definitions:  df-bi 117  df-tru 1375  df-nf 1483  df-sb 1785  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-v 2773  df-in 3171

This theorem is referenced by:  in12  3383  inindi  3389  dfrab2  3447  dfrab3  3448  disjpr2  3696  resres  4968  imainrect  5125  ssenen  6930  minmax  11460  xrminmax  11495  nnmindc  12274  nnminle  12275  setsfun  12786  setsfun0  12787  ressressg  12826  tgrest  14559