Theorem ineq1i 3360

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 3357	. 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶))
3	1, 2	ax-mp 5	1 ⊢ (𝐴 ∩ 𝐶) = (𝐵 ∩ 𝐶)

Syntax hints:   = wceq 1364   ∩ cin 3156

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 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-in 3163

This theorem is referenced by:  in12  3374  inindi  3380  dfrab2  3438  dfrab3  3439  disjpr2  3686  resres  4958  imainrect  5115  ssenen  6912  minmax  11395  xrminmax  11430  nnmindc  12201  nnminle  12202  setsfun  12713  setsfun0  12714  ressressg  12753  tgrest  14405