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Mirrors > Home > MPE Home > Th. List > rspcedeq2vd | Structured version Visualization version GIF version |
Description: Restricted existential specialization, using implicit substitution. Variant of rspcedvd 3628 for equations, in which the right hand side depends on the quantified variable. (Contributed by AV, 24-Dec-2019.) |
Ref | Expression |
---|---|
rspcedeqvd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) |
rspcedeqvd.2 | ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → 𝐶 = 𝐷) |
Ref | Expression |
---|---|
rspcedeq2vd | ⊢ (𝜑 → ∃𝑥 ∈ 𝐵 𝐶 = 𝐷) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rspcedeqvd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
2 | rspcedeqvd.2 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → 𝐶 = 𝐷) | |
3 | 2 | eqcomd 2829 | . . 3 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → 𝐷 = 𝐶) |
4 | 3 | eqeq2d 2834 | . 2 ⊢ ((𝜑 ∧ 𝑥 = 𝐴) → (𝐶 = 𝐷 ↔ 𝐶 = 𝐶)) |
5 | eqidd 2824 | . 2 ⊢ (𝜑 → 𝐶 = 𝐶) | |
6 | 1, 4, 5 | rspcedvd 3628 | 1 ⊢ (𝜑 → ∃𝑥 ∈ 𝐵 𝐶 = 𝐷) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∃wrex 3141 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 df-cleq 2816 df-clel 2895 df-ral 3145 df-rex 3146 |
This theorem is referenced by: symgextfo 18552 smatvscl 21135 eucrctshift 28024 ntrclsneine0lem 40421 mogoldbblem 43892 sbgoldbwt 43949 sbgoldbo 43959 |
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