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Mirrors > Home > MPE Home > Th. List > negne0bi | Structured version Visualization version GIF version |
Description: A number is nonzero iff its negative is nonzero. (Contributed by NM, 10-Aug-1999.) |
Ref | Expression |
---|---|
negidi.1 | ⊢ 𝐴 ∈ ℂ |
Ref | Expression |
---|---|
negne0bi | ⊢ (𝐴 ≠ 0 ↔ -𝐴 ≠ 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negidi.1 | . . 3 ⊢ 𝐴 ∈ ℂ | |
2 | negeq0 11258 | . . 3 ⊢ (𝐴 ∈ ℂ → (𝐴 = 0 ↔ -𝐴 = 0)) | |
3 | 1, 2 | ax-mp 5 | . 2 ⊢ (𝐴 = 0 ↔ -𝐴 = 0) |
4 | 3 | necon3bii 2997 | 1 ⊢ (𝐴 ≠ 0 ↔ -𝐴 ≠ 0) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 = wceq 1541 ∈ wcel 2109 ≠ wne 2944 ℂcc 10853 0cc0 10855 -cneg 11189 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-resscn 10912 ax-1cn 10913 ax-icn 10914 ax-addcl 10915 ax-addrcl 10916 ax-mulcl 10917 ax-mulrcl 10918 ax-mulcom 10919 ax-addass 10920 ax-mulass 10921 ax-distr 10922 ax-i2m1 10923 ax-1ne0 10924 ax-1rid 10925 ax-rnegex 10926 ax-rrecex 10927 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 ax-pre-ltadd 10931 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-reu 3072 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4845 df-br 5079 df-opab 5141 df-mpt 5162 df-id 5488 df-po 5502 df-so 5503 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-riota 7225 df-ov 7271 df-oprab 7272 df-mpo 7273 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-pnf 10995 df-mnf 10996 df-ltxr 10998 df-sub 11190 df-neg 11191 |
This theorem is referenced by: negne0i 11279 |
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