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Mirrors > Home > MPE Home > Th. List > neeqtri | Structured version Visualization version GIF version |
Description: Substitution of equal classes into an inequality. (Contributed by NM, 4-Jul-2012.) |
Ref | Expression |
---|---|
neeqtr.1 | ⊢ 𝐴 ≠ 𝐵 |
neeqtr.2 | ⊢ 𝐵 = 𝐶 |
Ref | Expression |
---|---|
neeqtri | ⊢ 𝐴 ≠ 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neeqtr.1 | . 2 ⊢ 𝐴 ≠ 𝐵 | |
2 | neeqtr.2 | . . 3 ⊢ 𝐵 = 𝐶 | |
3 | 2 | neeq2i 3049 | . 2 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐴 ≠ 𝐶) |
4 | 1, 3 | mpbi 231 | 1 ⊢ 𝐴 ≠ 𝐶 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1522 ≠ wne 2984 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1777 ax-4 1791 ax-5 1888 ax-6 1947 ax-7 1992 ax-9 2091 ax-ext 2769 |
This theorem depends on definitions: df-bi 208 df-an 397 df-ex 1762 df-cleq 2788 df-ne 2985 |
This theorem is referenced by: neeqtrri 3057 |
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