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| Mirrors > Home > MPE Home > Th. List > 1t1e1ALT | Structured version Visualization version GIF version | ||
| Description: Alternate proof of 1t1e1 12528 using a different set of axioms (add ax-mulrcl 11287, ax-i2m1 11292, ax-1ne0 11293, ax-rrecex 11296 and remove ax-resscn 11281, ax-mulcom 11288, ax-mulass 11290, ax-distr 11291). (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 11332 | . 2 ⊢ 1 ∈ ℝ | |
| 2 | ax-1rid 11294 | . 2 ⊢ (1 ∈ ℝ → (1 · 1) = 1) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (1 · 1) = 1 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∈ wcel 2147 (class class class)co 7440 ℝcr 11223 1c1 11225 · cmul 11229 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-1cn 11282 ax-icn 11283 ax-addcl 11284 ax-mulcl 11286 ax-mulrcl 11287 ax-i2m1 11292 ax-1ne0 11293 ax-1rid 11294 ax-rrecex 11296 ax-cnre 11297 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-iota 6509 df-fv 6563 df-ov 7443 |
| This theorem is used by: nnmul1com 12419 remulinvcom 43675 sn-0tie0 43706 |
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