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Mirrors > Home > MPE Home > Th. List > negcon1 | Structured version Visualization version GIF version |
Description: Negative contraposition law. (Contributed by NM, 9-May-2004.) |
Ref | Expression |
---|---|
negcon1 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 = 𝐵 ↔ -𝐵 = 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negcl 11461 | . . . 4 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
2 | neg11 11512 | . . . 4 ⊢ ((-𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ -𝐴 = 𝐵)) | |
3 | 1, 2 | sylan 579 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ -𝐴 = 𝐵)) |
4 | negneg 11511 | . . . . 5 ⊢ (𝐴 ∈ ℂ → --𝐴 = 𝐴) | |
5 | 4 | adantr 480 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → --𝐴 = 𝐴) |
6 | 5 | eqeq1d 2728 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ 𝐴 = -𝐵)) |
7 | 3, 6 | bitr3d 281 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 = 𝐵 ↔ 𝐴 = -𝐵)) |
8 | eqcom 2733 | . 2 ⊢ (𝐴 = -𝐵 ↔ -𝐵 = 𝐴) | |
9 | 7, 8 | bitrdi 287 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 = 𝐵 ↔ -𝐵 = 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1533 ∈ wcel 2098 ℂcc 11107 -cneg 11446 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-po 5581 df-so 5582 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11251 df-mnf 11252 df-ltxr 11254 df-sub 11447 df-neg 11448 |
This theorem is referenced by: negcon2 11514 negcon1i 11543 negcon1d 11566 elznn0 12574 |
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