Theorem difeq1i 3190

Description: Inference adding difference to the right in a class equality. (Contributed by NM, 15-Nov-2002.)

Hypothesis

Ref	Expression
difeq1i.1	⊢ 𝐴 = 𝐵

Assertion

Ref	Expression
difeq1i	⊢ (𝐴 ∖ 𝐶) = (𝐵 ∖ 𝐶)

Proof of Theorem difeq1i

Step	Hyp	Ref	Expression
1		difeq1i.1	. 2 ⊢ 𝐴 = 𝐵
2		difeq1 3187	. 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∖ 𝐶) = (𝐵 ∖ 𝐶))
3	1, 2	ax-mp 5	1 ⊢ (𝐴 ∖ 𝐶) = (𝐵 ∖ 𝐶)

Syntax hints:   = wceq 1331   ∖ cdif 3068

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 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121

This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-rab 2425  df-dif 3073

This theorem is referenced by:  difeq12i  3192  indif1  3321  indifcom  3322  difun1  3336  notab  3346  notrab  3353  difprsn1  3659  difprsn2  3660  orddif  4462  resdifcom  4837  resdmdfsn  4862  phplem1  6746  dfn2  8990