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| Mirrors > Home > MPE Home > Th. List > 1t1e1ALT | Structured version Visualization version GIF version | ||
| Description: Alternate proof of 1t1e1 12333 using a different set of axioms (add ax-mulrcl 11096, ax-i2m1 11101, ax-1ne0 11102, ax-rrecex 11105 and remove ax-resscn 11090, ax-mulcom 11097, ax-mulass 11099, ax-distr 11100). (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 11139 | . 2 ⊢ 1 ∈ ℝ | |
| 2 | ax-1rid 11103 | . 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 1548 ∈ wcel 2121 (class class class)co 7360 ℝcr 11032 1c1 11034 · cmul 11038 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-1cn 11091 ax-icn 11092 ax-addcl 11093 ax-mulcl 11095 ax-mulrcl 11096 ax-i2m1 11101 ax-1ne0 11102 ax-1rid 11103 ax-rrecex 11105 ax-cnre 11106 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-dif 3888 df-un 3890 df-ss 3902 df-nul 4265 df-if 4458 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-br 5076 df-iota 6445 df-fv 6497 df-ov 7363 |
| This theorem is referenced by: nnmul1com 12229 remulinvcom 42925 sn-0tie0 42956 |
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