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Mirrors > Home > MPE Home > Th. List > rspceeqv | Structured version Visualization version GIF version |
Description: Restricted existential specialization in an equality, using implicit substitution. (Contributed by BJ, 2-Sep-2022.) |
Ref | Expression |
---|---|
rspceeqv.1 | ⊢ (𝑥 = 𝐴 → 𝐶 = 𝐷) |
Ref | Expression |
---|---|
rspceeqv | ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐸 = 𝐷) → ∃𝑥 ∈ 𝐵 𝐸 = 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rspceeqv.1 | . . 3 ⊢ (𝑥 = 𝐴 → 𝐶 = 𝐷) | |
2 | 1 | eqeq2d 2749 | . 2 ⊢ (𝑥 = 𝐴 → (𝐸 = 𝐶 ↔ 𝐸 = 𝐷)) |
3 | 2 | rspcev 3552 | 1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐸 = 𝐷) → ∃𝑥 ∈ 𝐵 𝐸 = 𝐶) |
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