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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-speiv | Structured version Visualization version GIF version |
Description: Version of spei 2261 with a dv condition, which does not require ax-13 2246 (neither ax-7 1935 nor ax-12 2047). (Contributed by BJ, 31-May-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-speiv.1 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
bj-speiv.2 | ⊢ 𝜓 |
Ref | Expression |
---|---|
bj-speiv | ⊢ ∃𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax6ev 1890 | . 2 ⊢ ∃𝑥 𝑥 = 𝑦 | |
2 | bj-speiv.2 | . . 3 ⊢ 𝜓 | |
3 | bj-speiv.1 | . . 3 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
4 | 2, 3 | mpbiri 248 | . 2 ⊢ (𝑥 = 𝑦 → 𝜑) |
5 | 1, 4 | eximii 1764 | 1 ⊢ ∃𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∃wex 1704 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-6 1888 |
This theorem depends on definitions: df-bi 197 df-ex 1705 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |