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| Mirrors > Home > MPE Home > Th. List > addeq0 | Structured version Visualization version GIF version | ||
| Description: Two complex numbers add up to zero iff they are each other's opposites. (Contributed by Thierry Arnoux, 2-May-2017.) |
| Ref | Expression |
|---|---|
| addeq0 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐴 + 𝐵) = 0 ↔ 𝐴 = -𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0cnd 11198 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → 0 ∈ ℂ) | |
| 2 | simpr 489 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → 𝐵 ∈ ℂ) | |
| 3 | simpl 487 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → 𝐴 ∈ ℂ) | |
| 4 | 1, 2, 3 | subadd2d 11587 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐵) = 𝐴 ↔ (𝐴 + 𝐵) = 0)) |
| 5 | df-neg 11443 | . . . 4 ⊢ -𝐵 = (0 − 𝐵) | |
| 6 | 5 | eqeq1i 2766 | . . 3 ⊢ (-𝐵 = 𝐴 ↔ (0 − 𝐵) = 𝐴) |
| 7 | eqcom 2768 | . . 3 ⊢ (-𝐵 = 𝐴 ↔ 𝐴 = -𝐵) | |
| 8 | 6, 7 | bitr3i 280 | . 2 ⊢ ((0 − 𝐵) = 𝐴 ↔ 𝐴 = -𝐵) |
| 9 | 4, 8 | bitr3di 289 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐴 + 𝐵) = 0 ↔ 𝐴 = -𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1568 ∈ wcel 2141 (class class class)co 7410 ℂcc 11097 0cc0 11099 + caddc 11102 − cmin 11440 -cneg 11441 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5256 ax-nul 5268 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-resscn 11156 ax-1cn 11157 ax-icn 11158 ax-addcl 11159 ax-addrcl 11160 ax-mulcl 11161 ax-mulrcl 11162 ax-mulcom 11163 ax-addass 11164 ax-mulass 11165 ax-distr 11166 ax-i2m1 11167 ax-1ne0 11168 ax-1rid 11169 ax-rnegex 11170 ax-rrecex 11171 ax-cnre 11172 ax-pre-lttri 11173 ax-pre-lttrn 11174 ax-pre-ltadd 11175 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-nf 1812 df-sb 2095 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-opab 5173 df-mpt 5192 df-id 5556 df-po 5569 df-so 5570 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-er 8693 df-en 8943 df-dom 8944 df-sdom 8945 df-pnf 11244 df-mnf 11245 df-ltxr 11247 df-sub 11442 df-neg 11443 |
| This theorem is referenced by: constrrtcclem 34090 constrsqrtcl 34135 cos9thpiminplylem4 34141 cos9thpiminplylem5 34142 cos9thpinconstrlem1 34145 ballotlemfrceq 34885 sqrtcval 44337 rrx2linest 49489 itsclquadb 49523 |
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