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Mirrors > Home > MPE Home > Th. List > reim0 | Structured version Visualization version GIF version |
Description: The imaginary part of a real number is 0. (Contributed by NM, 18-Mar-2005.) (Revised by Mario Carneiro, 7-Nov-2013.) |
Ref | Expression |
---|---|
reim0 | ⊢ (𝐴 ∈ ℝ → (ℑ‘𝐴) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | recn 11243 | . . . 4 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
2 | it0e0 12486 | . . . . . 6 ⊢ (i · 0) = 0 | |
3 | 2 | oveq2i 7442 | . . . . 5 ⊢ (𝐴 + (i · 0)) = (𝐴 + 0) |
4 | addrid 11439 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴 + 0) = 𝐴) | |
5 | 3, 4 | eqtrid 2787 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 + (i · 0)) = 𝐴) |
6 | 1, 5 | syl 17 | . . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 + (i · 0)) = 𝐴) |
7 | 6 | fveq2d 6911 | . 2 ⊢ (𝐴 ∈ ℝ → (ℑ‘(𝐴 + (i · 0))) = (ℑ‘𝐴)) |
8 | 0re 11261 | . . 3 ⊢ 0 ∈ ℝ | |
9 | crim 15151 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (ℑ‘(𝐴 + (i · 0))) = 0) | |
10 | 8, 9 | mpan2 691 | . 2 ⊢ (𝐴 ∈ ℝ → (ℑ‘(𝐴 + (i · 0))) = 0) |
11 | 7, 10 | eqtr3d 2777 | 1 ⊢ (𝐴 ∈ ℝ → (ℑ‘𝐴) = 0) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2106 ‘cfv 6563 (class class class)co 7431 ℂcc 11151 ℝcr 11152 0cc0 11153 ici 11155 + caddc 11156 · cmul 11158 ℑcim 15134 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-po 5597 df-so 5598 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-2 12327 df-cj 15135 df-re 15136 df-im 15137 |
This theorem is referenced by: reim0b 15155 rereb 15156 remul2 15166 immul2 15173 im0 15189 im1 15191 reim0d 15261 sqrtneglem 15302 rlimrecl 15613 recld2 24850 relogrn 26618 logrnaddcl 26631 |
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