Theorem iuneq1d 3992

Description: Equality theorem for indexed union, deduction version. (Contributed by Drahflow, 22-Oct-2015.)

Hypothesis

Ref	Expression
iuneq1d.1	⊢ (φ → A = B)

Assertion

Ref	Expression
iuneq1d	⊢ (φ → ∪x ∈ A C = ∪x ∈ B C)

Distinct variable groups:   x,A   x,B

Allowed substitution hints:   φ(x)   C(x)

Proof of Theorem iuneq1d

Step	Hyp	Ref	Expression
1		iuneq1d.1	. 2 ⊢ (φ → A = B)
2		iuneq1 3982	. 2 ⊢ (A = B → ∪x ∈ A C = ∪x ∈ B C)
3	1, 2	syl 15	1 ⊢ (φ → ∪x ∈ A C = ∪x ∈ B C)

Syntax hints:   → wi 4   = wceq 1642  ∪ciun 3969

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ral 2619  df-rex 2620  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259  df-iun 3971

This theorem is referenced by:  iuneq12d  3993