Theorem cbvditgdavw 37248

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

Hypothesis

Ref	Expression
cbvditgdavw.1	⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐶 = 𝐷)

Assertion

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

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

Allowed substitution hints:   𝐶(𝑥)   𝐷(𝑦)

Proof of Theorem cbvditgdavw

Step	Hyp	Ref	Expression
1		cbvditgdavw.1	. . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝑦) → 𝐶 = 𝐷)
2	1	cbvitgdavw 37247	. . 3 ⊢ (𝜑 → ∫(𝐴(,)𝐵)𝐶 d𝑥 = ∫(𝐴(,)𝐵)𝐷 d𝑦)
3	1	cbvitgdavw 37247	. . . 4 ⊢ (𝜑 → ∫(𝐵(,)𝐴)𝐶 d𝑥 = ∫(𝐵(,)𝐴)𝐷 d𝑦)
4	3	negeqd 11575	. . 3 ⊢ (𝜑 → -∫(𝐵(,)𝐴)𝐶 d𝑥 = -∫(𝐵(,)𝐴)𝐷 d𝑦)
5	2, 4	ifeq12d 4507	. 2 ⊢ (𝜑 → if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥) = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐷 d𝑦, -∫(𝐵(,)𝐴)𝐷 d𝑦))
6		df-ditg 26194	. 2 ⊢ ⨜[𝐴 → 𝐵]𝐶 d𝑥 = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐶 d𝑥, -∫(𝐵(,)𝐴)𝐶 d𝑥)
7		df-ditg 26194	. 2 ⊢ ⨜[𝐴 → 𝐵]𝐷 d𝑦 = if(𝐴 ≤ 𝐵, ∫(𝐴(,)𝐵)𝐷 d𝑦, -∫(𝐵(,)𝐴)𝐷 d𝑦)
8	5, 6, 7	3eqtr4g 2823	1 ⊢ (𝜑 → ⨜[𝐴 → 𝐵]𝐶 d𝑥 = ⨜[𝐴 → 𝐵]𝐷 d𝑦)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570  ifcif 4485   class class class wbr 5106  (class class class)co 7440   ≤ cle 11368   -cneg 11566  (,)cioo 13500  ∫citg 25966  ⨜cdit 26193

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-mpt 5190  df-xp 5661  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-pred 6319  df-iota 6509  df-fv 6563  df-ov 7443  df-oprab 7444  df-mpo 7445  df-frecs 8324  df-wrecs 8355  df-recs 8404  df-rdg 8443  df-neg 11568  df-seq 14169  df-sum 15880  df-itg 25971  df-ditg 26194

This theorem is used by: (None)