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| Mirrors > Home > PE Home > Th. List > ax-L9-multr | |||
| Description: Right '⋅' substitution. |
| Ref | Expression |
|---|---|
| ax-L9-multr | ⊢ (𝑡 = 𝑢 → (𝑤 ⋅ 𝑡) = (𝑤 ⋅ 𝑢)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | term-t | . . 3 term 𝑡 | |
| 2 | term-u | . . 3 term 𝑢 | |
| 3 | 1, 2 | wff-equals 6 | . 2 wff 𝑡 = 𝑢 |
| 4 | term-w | . . . 4 term 𝑤 | |
| 5 | 4, 1 | term-mult 5 | . . 3 term (𝑤 ⋅ 𝑡) |
| 6 | 4, 2 | term-mult 5 | . . 3 term (𝑤 ⋅ 𝑢) |
| 7 | 5, 6 | wff-equals 6 | . 2 wff (𝑤 ⋅ 𝑡) = (𝑤 ⋅ 𝑢) |
| 8 | 3, 7 | wff-imp 10 | 1 wff (𝑡 = 𝑢 → (𝑤 ⋅ 𝑡) = (𝑤 ⋅ 𝑢)) |
| Colors of variables: wff objvar term class |
| This axiom is referenced by: submultr-P5 650 |
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