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Mirrors > Home > MPE Home > Th. List > absgt0 | Structured version Visualization version GIF version |
Description: The absolute value of a nonzero number is positive. (Contributed by NM, 1-Oct-1999.) (Proof shortened by Mario Carneiro, 29-May-2016.) |
Ref | Expression |
---|---|
absgt0 | ⊢ (𝐴 ∈ ℂ → (𝐴 ≠ 0 ↔ 0 < (abs‘𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0red 10672 | . . 3 ⊢ (𝐴 ∈ ℂ → 0 ∈ ℝ) | |
2 | abscl 14676 | . . 3 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
3 | absge0 14685 | . . 3 ⊢ (𝐴 ∈ ℂ → 0 ≤ (abs‘𝐴)) | |
4 | 1, 2, 3 | leltned 10821 | . 2 ⊢ (𝐴 ∈ ℂ → (0 < (abs‘𝐴) ↔ (abs‘𝐴) ≠ 0)) |
5 | abs00 14687 | . . 3 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) = 0 ↔ 𝐴 = 0)) | |
6 | 5 | necon3bid 2996 | . 2 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) ≠ 0 ↔ 𝐴 ≠ 0)) |
7 | 4, 6 | bitr2d 283 | 1 ⊢ (𝐴 ∈ ℂ → (𝐴 ≠ 0 ↔ 0 < (abs‘𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∈ wcel 2112 ≠ wne 2952 class class class wbr 5030 ‘cfv 6333 ℂcc 10563 0cc0 10565 < clt 10703 abscabs 14631 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-sep 5167 ax-nul 5174 ax-pow 5232 ax-pr 5296 ax-un 7457 ax-cnex 10621 ax-resscn 10622 ax-1cn 10623 ax-icn 10624 ax-addcl 10625 ax-addrcl 10626 ax-mulcl 10627 ax-mulrcl 10628 ax-mulcom 10629 ax-addass 10630 ax-mulass 10631 ax-distr 10632 ax-i2m1 10633 ax-1ne0 10634 ax-1rid 10635 ax-rnegex 10636 ax-rrecex 10637 ax-cnre 10638 ax-pre-lttri 10639 ax-pre-lttrn 10640 ax-pre-ltadd 10641 ax-pre-mulgt0 10642 ax-pre-sup 10643 |
This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2902 df-ne 2953 df-nel 3057 df-ral 3076 df-rex 3077 df-reu 3078 df-rmo 3079 df-rab 3080 df-v 3412 df-sbc 3698 df-csb 3807 df-dif 3862 df-un 3864 df-in 3866 df-ss 3876 df-pss 3878 df-nul 4227 df-if 4419 df-pw 4494 df-sn 4521 df-pr 4523 df-tp 4525 df-op 4527 df-uni 4797 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5428 df-eprel 5433 df-po 5441 df-so 5442 df-fr 5481 df-we 5483 df-xp 5528 df-rel 5529 df-cnv 5530 df-co 5531 df-dm 5532 df-rn 5533 df-res 5534 df-ima 5535 df-pred 6124 df-ord 6170 df-on 6171 df-lim 6172 df-suc 6173 df-iota 6292 df-fun 6335 df-fn 6336 df-f 6337 df-f1 6338 df-fo 6339 df-f1o 6340 df-fv 6341 df-riota 7106 df-ov 7151 df-oprab 7152 df-mpo 7153 df-om 7578 df-2nd 7692 df-wrecs 7955 df-recs 8016 df-rdg 8054 df-er 8297 df-en 8526 df-dom 8527 df-sdom 8528 df-sup 8929 df-pnf 10705 df-mnf 10706 df-xr 10707 df-ltxr 10708 df-le 10709 df-sub 10900 df-neg 10901 df-div 11326 df-nn 11665 df-2 11727 df-3 11728 df-n0 11925 df-z 12011 df-uz 12273 df-rp 12421 df-seq 13409 df-exp 13470 df-cj 14496 df-re 14497 df-im 14498 df-sqrt 14632 df-abs 14633 |
This theorem is referenced by: nnabscl 14723 absgt0i 14797 absabv 20213 dveflem 24668 abelthlem2 25116 nmophmi 29903 unbdqndv2lem1 34228 ftc1anclem7 35406 ftc1anc 35408 pellexlem2 40134 dvgrat 41379 fourierdlem42 43147 |
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