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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-ax6elem2 | Structured version Visualization version GIF version |
Description: Lemma for bj-ax6e 36651. (Contributed by BJ, 22-Dec-2020.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-ax6elem2 | ⊢ (∀𝑥 𝑦 = 𝑧 → ∃𝑥 𝑥 = 𝑦) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax6ev 1967 | . . 3 ⊢ ∃𝑥 𝑥 = 𝑧 | |
2 | equeucl 2021 | . . 3 ⊢ (𝑥 = 𝑧 → (𝑦 = 𝑧 → 𝑥 = 𝑦)) | |
3 | 1, 2 | eximii 1834 | . 2 ⊢ ∃𝑥(𝑦 = 𝑧 → 𝑥 = 𝑦) |
4 | 3 | 19.35i 1876 | 1 ⊢ (∀𝑥 𝑦 = 𝑧 → ∃𝑥 𝑥 = 𝑦) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1535 ∃wex 1776 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 |
This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1777 |
This theorem is referenced by: bj-ax6e 36651 |
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