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Mirrors > Home > MPE Home > Th. List > msq0i | Structured version Visualization version GIF version |
Description: A number is zero iff its square is zero (where square is represented using multiplication). (Contributed by NM, 28-Jul-1999.) |
Ref | Expression |
---|---|
mul0or.1 | ⊢ 𝐴 ∈ ℂ |
Ref | Expression |
---|---|
msq0i | ⊢ ((𝐴 · 𝐴) = 0 ↔ 𝐴 = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mul0or.1 | . . 3 ⊢ 𝐴 ∈ ℂ | |
2 | mul0or 11795 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝐴 · 𝐴) = 0 ↔ (𝐴 = 0 ∨ 𝐴 = 0))) | |
3 | 1, 1, 2 | mp2an 690 | . 2 ⊢ ((𝐴 · 𝐴) = 0 ↔ (𝐴 = 0 ∨ 𝐴 = 0)) |
4 | oridm 903 | . 2 ⊢ ((𝐴 = 0 ∨ 𝐴 = 0) ↔ 𝐴 = 0) | |
5 | 3, 4 | bitri 274 | 1 ⊢ ((𝐴 · 𝐴) = 0 ↔ 𝐴 = 0) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∨ wo 845 = wceq 1541 ∈ wcel 2106 (class class class)co 7357 ℂcc 11049 0cc0 11051 · cmul 11056 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2707 ax-sep 5256 ax-nul 5263 ax-pow 5320 ax-pr 5384 ax-un 7672 ax-resscn 11108 ax-1cn 11109 ax-icn 11110 ax-addcl 11111 ax-addrcl 11112 ax-mulcl 11113 ax-mulrcl 11114 ax-mulcom 11115 ax-addass 11116 ax-mulass 11117 ax-distr 11118 ax-i2m1 11119 ax-1ne0 11120 ax-1rid 11121 ax-rnegex 11122 ax-rrecex 11123 ax-cnre 11124 ax-pre-lttri 11125 ax-pre-lttrn 11126 ax-pre-ltadd 11127 ax-pre-mulgt0 11128 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3065 df-rex 3074 df-reu 3354 df-rab 3408 df-v 3447 df-sbc 3740 df-csb 3856 df-dif 3913 df-un 3915 df-in 3917 df-ss 3927 df-nul 4283 df-if 4487 df-pw 4562 df-sn 4587 df-pr 4589 df-op 4593 df-uni 4866 df-br 5106 df-opab 5168 df-mpt 5189 df-id 5531 df-po 5545 df-so 5546 df-xp 5639 df-rel 5640 df-cnv 5641 df-co 5642 df-dm 5643 df-rn 5644 df-res 5645 df-ima 5646 df-iota 6448 df-fun 6498 df-fn 6499 df-f 6500 df-f1 6501 df-fo 6502 df-f1o 6503 df-fv 6504 df-riota 7313 df-ov 7360 df-oprab 7361 df-mpo 7362 df-er 8648 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11191 df-mnf 11192 df-xr 11193 df-ltxr 11194 df-le 11195 df-sub 11387 df-neg 11388 |
This theorem is referenced by: (None) |
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