Theorem acongeq12d 42936

Description: Substitution deduction for alternating congruence. (Contributed by Stefan O'Rear, 3-Oct-2014.)

Hypotheses

Ref	Expression
acongeq12d.1	⊢ (𝜑 → 𝐵 = 𝐶)
acongeq12d.2	⊢ (𝜑 → 𝐷 = 𝐸)

Assertion

Ref	Expression
acongeq12d	⊢ (𝜑 → ((𝐴 ∥ (𝐵 − 𝐷) ∨ 𝐴 ∥ (𝐵 − -𝐷)) ↔ (𝐴 ∥ (𝐶 − 𝐸) ∨ 𝐴 ∥ (𝐶 − -𝐸))))

Proof of Theorem acongeq12d

Step	Hyp	Ref	Expression
1		acongeq12d.1	. . . 4 ⊢ (𝜑 → 𝐵 = 𝐶)
2		acongeq12d.2	. . . 4 ⊢ (𝜑 → 𝐷 = 𝐸)
3	1, 2	oveq12d 7432	. . 3 ⊢ (𝜑 → (𝐵 − 𝐷) = (𝐶 − 𝐸))
4	3	breq2d 5137	. 2 ⊢ (𝜑 → (𝐴 ∥ (𝐵 − 𝐷) ↔ 𝐴 ∥ (𝐶 − 𝐸)))
5	2	negeqd 11485	. . . 4 ⊢ (𝜑 → -𝐷 = -𝐸)
6	1, 5	oveq12d 7432	. . 3 ⊢ (𝜑 → (𝐵 − -𝐷) = (𝐶 − -𝐸))
7	6	breq2d 5137	. 2 ⊢ (𝜑 → (𝐴 ∥ (𝐵 − -𝐷) ↔ 𝐴 ∥ (𝐶 − -𝐸)))
8	4, 7	orbi12d 918	1 ⊢ (𝜑 → ((𝐴 ∥ (𝐵 − 𝐷) ∨ 𝐴 ∥ (𝐵 − -𝐷)) ↔ (𝐴 ∥ (𝐶 − 𝐸) ∨ 𝐴 ∥ (𝐶 − -𝐸))))

Syntax hints:   → wi 4   ↔ wb 206   ∨ wo 847   = wceq 1539   class class class wbr 5125  (class class class)co 7414   − cmin 11475  -cneg 11476   ∥ cdvds 16273

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2706

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2713  df-cleq 2726  df-clel 2808  df-rab 3421  df-v 3466  df-dif 3936  df-un 3938  df-ss 3950  df-nul 4316  df-if 4508  df-sn 4609  df-pr 4611  df-op 4615  df-uni 4890  df-br 5126  df-iota 6495  df-fv 6550  df-ov 7417  df-neg 11478

This theorem is referenced by:  acongrep  42937  jm2.26a  42957  jm2.26  42959