Theorem cbvditgdavw2 36256

Description: Change bound variable and limits in a directed integral. Deduction form. (Contributed by GG, 14-Aug-2025.)

Hypotheses

Ref	Expression
cbvditgdavw2.1	⊢ (𝜑 → 𝐴 = 𝐵)
cbvditgdavw2.2	⊢ (𝜑 → 𝐶 = 𝐷)
cbvditgdavw2.3	⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐸 = 𝐹)

Assertion

Ref	Expression
cbvditgdavw2	⊢ (𝜑 → ⨜[𝐴 → 𝐶]𝐸 d𝑥 = ⨜[𝐵 → 𝐷]𝐹 d𝑦)

Distinct variable groups:   𝜑,𝑥,𝑦   𝑦,𝐴   𝑥,𝐵   𝑦,𝐶   𝑥,𝐷   𝑦,𝐸   𝑥,𝐹

Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑦)   𝐶(𝑥)   𝐷(𝑦)   𝐸(𝑥)   𝐹(𝑦)

Proof of Theorem cbvditgdavw2

Step	Hyp	Ref	Expression
1		cbvditgdavw2.1	. . . 4 ⊢ (𝜑 → 𝐴 = 𝐵)
2		cbvditgdavw2.2	. . . 4 ⊢ (𝜑 → 𝐶 = 𝐷)
3	1, 2	breq12d 5179	. . 3 ⊢ (𝜑 → (𝐴 ≤ 𝐶 ↔ 𝐵 ≤ 𝐷))
4		cbvditgdavw2.3	. . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐸 = 𝐹)
5	1	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐴 = 𝐵)
6	2	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐶 = 𝐷)
7	5, 6	oveq12d 7461	. . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → (𝐴(,)𝐶) = (𝐵(,)𝐷))
8	4, 7	cbvitgdavw2 36255	. . 3 ⊢ (𝜑 → ∫(𝐴(,)𝐶)𝐸 d𝑥 = ∫(𝐵(,)𝐷)𝐹 d𝑦)
9	6, 5	oveq12d 7461	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → (𝐶(,)𝐴) = (𝐷(,)𝐵))
10	4, 9	cbvitgdavw2 36255	. . . 4 ⊢ (𝜑 → ∫(𝐶(,)𝐴)𝐸 d𝑥 = ∫(𝐷(,)𝐵)𝐹 d𝑦)
11	10	negeqd 11524	. . 3 ⊢ (𝜑 → -∫(𝐶(,)𝐴)𝐸 d𝑥 = -∫(𝐷(,)𝐵)𝐹 d𝑦)
12	3, 8, 11	ifbieq12d 4576	. 2 ⊢ (𝜑 → if(𝐴 ≤ 𝐶, ∫(𝐴(,)𝐶)𝐸 d𝑥, -∫(𝐶(,)𝐴)𝐸 d𝑥) = if(𝐵 ≤ 𝐷, ∫(𝐵(,)𝐷)𝐹 d𝑦, -∫(𝐷(,)𝐵)𝐹 d𝑦))
13		df-ditg 25894	. 2 ⊢ ⨜[𝐴 → 𝐶]𝐸 d𝑥 = if(𝐴 ≤ 𝐶, ∫(𝐴(,)𝐶)𝐸 d𝑥, -∫(𝐶(,)𝐴)𝐸 d𝑥)
14		df-ditg 25894	. 2 ⊢ ⨜[𝐵 → 𝐷]𝐹 d𝑦 = if(𝐵 ≤ 𝐷, ∫(𝐵(,)𝐷)𝐹 d𝑦, -∫(𝐷(,)𝐵)𝐹 d𝑦)
15	12, 13, 14	3eqtr4g 2805	1 ⊢ (𝜑 → ⨜[𝐴 → 𝐶]𝐸 d𝑥 = ⨜[𝐵 → 𝐷]𝐹 d𝑦)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1537  ifcif 4548   class class class wbr 5166  (class class class)co 7443   ≤ cle 11319  -cneg 11515  (,)cioo 13401  ∫citg 25664  ⨜cdit 25893

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2711

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-sbc 3805  df-csb 3922  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-mpt 5250  df-xp 5701  df-cnv 5703  df-co 5704  df-dm 5705  df-rn 5706  df-res 5707  df-ima 5708  df-pred 6327  df-iota 6520  df-fv 6576  df-ov 7446  df-oprab 7447  df-mpo 7448  df-frecs 8316  df-wrecs 8347  df-recs 8421  df-rdg 8460  df-neg 11517  df-seq 14047  df-sum 15729  df-itg 25669  df-ditg 25894

This theorem is referenced by: (None)