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| Mirrors > Home > MPE Home > Th. List > 1t1e1ALT | Structured version Visualization version GIF version | ||
| Description: Alternate proof of 1t1e1 12429 using a different set of axioms (add ax-mulrcl 11190, ax-i2m1 11195, ax-1ne0 11196, ax-rrecex 11199 and remove ax-resscn 11184, ax-mulcom 11191, ax-mulass 11193, ax-distr 11194). (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 11235 | . 2 ⊢ 1 ∈ ℝ | |
| 2 | ax-1rid 11197 | . 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 2145 (class class class)co 7416 ℝcr 11126 1c1 11128 · cmul 11132 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2734 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-mulcl 11189 ax-mulrcl 11190 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rrecex 11199 ax-cnre 11200 |
| 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 2100 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-iota 6493 df-fv 6545 df-ov 7419 |
| This theorem is used by: nnmul1com 12320 remulinvcom 43295 sn-0tie0 43326 |
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