Theorem difeq1i 3337

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 3334	. 2 ⊢ (𝐴 = 𝐵 → (𝐴 ∖ 𝐶) = (𝐵 ∖ 𝐶))
3	1, 2	ax-mp 5	1 ⊢ (𝐴 ∖ 𝐶) = (𝐵 ∖ 𝐶)

Syntax hints:   = wceq 1398   ∖ cdif 3211

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-rab 2531  df-dif 3216

This theorem is referenced by:  difeq12i  3339  indif1  3470  indifcom  3471  difun1  3485  notab  3495  notrab  3502  difprsn1  3838  difprsn2  3839  orddif  4674  resdifcom  5061  resdmdfsn  5086  phplem1  7119  dfn2  9526  ballotfilemfval0  13179