Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > 1neg1t1neg1 | Structured version Visualization version GIF version |
Description: An integer unit times itself. (Contributed by Thierry Arnoux, 23-Aug-2020.) |
Ref | Expression |
---|---|
1neg1t1neg1 | ⊢ (𝑁 ∈ {-1, 1} → (𝑁 · 𝑁) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpri 4538 | . 2 ⊢ (𝑁 ∈ {-1, 1} → (𝑁 = -1 ∨ 𝑁 = 1)) | |
2 | id 22 | . . . . 5 ⊢ (𝑁 = -1 → 𝑁 = -1) | |
3 | 2, 2 | oveq12d 7190 | . . . 4 ⊢ (𝑁 = -1 → (𝑁 · 𝑁) = (-1 · -1)) |
4 | neg1mulneg1e1 11931 | . . . 4 ⊢ (-1 · -1) = 1 | |
5 | 3, 4 | eqtrdi 2789 | . . 3 ⊢ (𝑁 = -1 → (𝑁 · 𝑁) = 1) |
6 | id 22 | . . . . 5 ⊢ (𝑁 = 1 → 𝑁 = 1) | |
7 | 6, 6 | oveq12d 7190 | . . . 4 ⊢ (𝑁 = 1 → (𝑁 · 𝑁) = (1 · 1)) |
8 | 1t1e1 11880 | . . . 4 ⊢ (1 · 1) = 1 | |
9 | 7, 8 | eqtrdi 2789 | . . 3 ⊢ (𝑁 = 1 → (𝑁 · 𝑁) = 1) |
10 | 5, 9 | jaoi 856 | . 2 ⊢ ((𝑁 = -1 ∨ 𝑁 = 1) → (𝑁 · 𝑁) = 1) |
11 | 1, 10 | syl 17 | 1 ⊢ (𝑁 ∈ {-1, 1} → (𝑁 · 𝑁) = 1) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∨ wo 846 = wceq 1542 ∈ wcel 2114 {cpr 4518 (class class class)co 7172 1c1 10618 · cmul 10622 -cneg 10951 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2710 ax-sep 5167 ax-nul 5174 ax-pow 5232 ax-pr 5296 ax-un 7481 ax-resscn 10674 ax-1cn 10675 ax-icn 10676 ax-addcl 10677 ax-addrcl 10678 ax-mulcl 10679 ax-mulrcl 10680 ax-mulcom 10681 ax-addass 10682 ax-mulass 10683 ax-distr 10684 ax-i2m1 10685 ax-1ne0 10686 ax-1rid 10687 ax-rnegex 10688 ax-rrecex 10689 ax-cnre 10690 ax-pre-lttri 10691 ax-pre-lttrn 10692 ax-pre-ltadd 10693 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-nel 3039 df-ral 3058 df-rex 3059 df-reu 3060 df-rab 3062 df-v 3400 df-sbc 3681 df-csb 3791 df-dif 3846 df-un 3848 df-in 3850 df-ss 3860 df-nul 4212 df-if 4415 df-pw 4490 df-sn 4517 df-pr 4519 df-op 4523 df-uni 4797 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5429 df-po 5442 df-so 5443 df-xp 5531 df-rel 5532 df-cnv 5533 df-co 5534 df-dm 5535 df-rn 5536 df-res 5537 df-ima 5538 df-iota 6297 df-fun 6341 df-fn 6342 df-f 6343 df-f1 6344 df-fo 6345 df-f1o 6346 df-fv 6347 df-riota 7129 df-ov 7175 df-oprab 7176 df-mpo 7177 df-er 8322 df-en 8558 df-dom 8559 df-sdom 8560 df-pnf 10757 df-mnf 10758 df-ltxr 10760 df-sub 10952 df-neg 10953 |
This theorem is referenced by: madjusmdetlem4 31354 |
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