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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 11432 | . . . 4 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
| 2 | neg11 11484 | . . . 4 ⊢ ((-𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ -𝐴 = 𝐵)) | |
| 3 | 1, 2 | sylan 589 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ -𝐴 = 𝐵)) |
| 4 | negneg 11483 | . . . . 5 ⊢ (𝐴 ∈ ℂ → --𝐴 = 𝐴) | |
| 5 | 4 | adantr 484 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → --𝐴 = 𝐴) |
| 6 | 5 | eqeq1d 2766 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (--𝐴 = -𝐵 ↔ 𝐴 = -𝐵)) |
| 7 | 3, 6 | bitr3d 283 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 = 𝐵 ↔ 𝐴 = -𝐵)) |
| 8 | eqcom 2771 | . 2 ⊢ (𝐴 = -𝐵 ↔ -𝐵 = 𝐴) | |
| 9 | 7, 8 | bitrdi 289 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 = 𝐵 ↔ -𝐵 = 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1562 ∈ wcel 2144 ℂcc 11073 -cneg 11417 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5544 df-po 5557 df-so 5558 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-riota 7355 df-ov 7401 df-oprab 7402 df-mpo 7403 df-er 8680 df-en 8930 df-dom 8931 df-sdom 8932 df-pnf 11220 df-mnf 11221 df-ltxr 11223 df-sub 11418 df-neg 11419 |
| This theorem is referenced by: negcon2 11486 negcon1i 11515 negcon1d 11538 elznn0 12585 ceilbi 47936 |
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