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| Mirrors > Home > MPE Home > Th. List > 1t1e1ALT | Structured version Visualization version GIF version | ||
| Description: Alternate proof of 1t1e1 12405 using a different set of axioms (add ax-mulrcl 11166, ax-i2m1 11171, ax-1ne0 11172, ax-rrecex 11175 and remove ax-resscn 11160, ax-mulcom 11167, ax-mulass 11169, ax-distr 11170). (Contributed by Steven Nguyen, 20-Sep-2022.) (Proof modification is discouraged.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| 1t1e1ALT | ⊢ (1 · 1) = 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1re 11211 | . 2 ⊢ 1 ∈ ℝ | |
| 2 | ax-1rid 11173 | . 2 ⊢ (1 ∈ ℝ → (1 · 1) = 1) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (1 · 1) = 1 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1568 ∈ wcel 2150 (class class class)co 7414 ℝcr 11102 1c1 11104 · cmul 11108 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2152 ax-9 2160 ax-ext 2742 ax-1cn 11161 ax-icn 11162 ax-addcl 11163 ax-mulcl 11165 ax-mulrcl 11166 ax-i2m1 11171 ax-1ne0 11172 ax-1rid 11173 ax-rrecex 11175 ax-cnre 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-sb 2099 df-clab 2749 df-cleq 2762 df-clel 2845 df-ne 2966 df-ral 3087 df-rex 3097 df-rab 3424 df-v 3464 df-dif 3916 df-un 3918 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-br 5115 df-iota 6496 df-fv 6548 df-ov 7417 |
| This theorem is referenced by: nnmul1com 12296 remulinvcom 43144 sn-0tie0 43175 |
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