angrtmuld - Metamath Proof Explorer

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Theorem angrtmuld 26788

Description: Perpendicularity of two vectors does not change under rescaling the second. (Contributed by David Moews, 28-Feb-2017.)

**Hypotheses**
Ref	Expression
ang.1	⊢ 𝐹 = (𝑥 ∈ (ℂ ∖ {0}), 𝑦 ∈ (ℂ ∖ {0}) ↦ (ℑ‘(log‘(𝑦 / 𝑥))))
angrtmuld.1	⊢ (𝜑 → 𝑋 ∈ ℂ)
angrtmuld.2	⊢ (𝜑 → 𝑌 ∈ ℂ)
angrtmuld.3	⊢ (𝜑 → 𝑍 ∈ ℂ)
angrtmuld.4	⊢ (𝜑 → 𝑋 ≠ 0)
angrtmuld.5	⊢ (𝜑 → 𝑌 ≠ 0)
angrtmuld.6	⊢ (𝜑 → 𝑍 ≠ 0)
angrtmuld.7	⊢ (𝜑 → (𝑍 / 𝑌) ∈ ℝ)

**Assertion**
Ref	Expression
angrtmuld	⊢ (𝜑 → ((𝑋𝐹𝑌) ∈ {(π / 2), -(π / 2)} ↔ (𝑋𝐹𝑍) ∈ {(π / 2), -(π / 2)}))

Distinct variable groups: 𝑥,𝑦,𝑋 𝑥,𝑌,𝑦 𝑥,𝑍,𝑦 Allowed substitution hints: 𝜑(𝑥,𝑦) 𝐹(𝑥,𝑦)

**Proof of Theorem angrtmuld**
Step	Hyp	Ref	Expression
1		angrtmuld.3	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ ℂ)
2		angrtmuld.2	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ ℂ)
3		angrtmuld.6	. . . . 5 ⊢ (𝜑 → 𝑍 ≠ 0)
4		angrtmuld.5	. . . . 5 ⊢ (𝜑 → 𝑌 ≠ 0)
5	1, 2, 3, 4	divne0d 11941	. . . 4 ⊢ (𝜑 → (𝑍 / 𝑌) ≠ 0)
6	5	neneqd 2938	. . 3 ⊢ (𝜑 → ¬ (𝑍 / 𝑌) = 0)
7		biorf 937	. . 3 ⊢ (¬ (𝑍 / 𝑌) = 0 → ((ℜ‘(𝑌 / 𝑋)) = 0 ↔ ((𝑍 / 𝑌) = 0 ∨ (ℜ‘(𝑌 / 𝑋)) = 0)))
8	6, 7	syl 17	. 2 ⊢ (𝜑 → ((ℜ‘(𝑌 / 𝑋)) = 0 ↔ ((𝑍 / 𝑌) = 0 ∨ (ℜ‘(𝑌 / 𝑋)) = 0)))
9		ang.1	. . 3 ⊢ 𝐹 = (𝑥 ∈ (ℂ ∖ {0}), 𝑦 ∈ (ℂ ∖ {0}) ↦ (ℑ‘(log‘(𝑦 / 𝑥))))
10		angrtmuld.1	. . 3 ⊢ (𝜑 → 𝑋 ∈ ℂ)
11		angrtmuld.4	. . 3 ⊢ (𝜑 → 𝑋 ≠ 0)
12	9, 10, 11, 2, 4	angrteqvd 26786	. 2 ⊢ (𝜑 → ((𝑋𝐹𝑌) ∈ {(π / 2), -(π / 2)} ↔ (ℜ‘(𝑌 / 𝑋)) = 0))
13	9, 10, 11, 1, 3	angrteqvd 26786	. . 3 ⊢ (𝜑 → ((𝑋𝐹𝑍) ∈ {(π / 2), -(π / 2)} ↔ (ℜ‘(𝑍 / 𝑋)) = 0))
14	1, 2, 10, 4, 11	dmdcan2d 11955	. . . . . 6 ⊢ (𝜑 → ((𝑍 / 𝑌) · (𝑌 / 𝑋)) = (𝑍 / 𝑋))
15	14	fveq2d 6839	. . . . 5 ⊢ (𝜑 → (ℜ‘((𝑍 / 𝑌) · (𝑌 / 𝑋))) = (ℜ‘(𝑍 / 𝑋)))
16		angrtmuld.7	. . . . . 6 ⊢ (𝜑 → (𝑍 / 𝑌) ∈ ℝ)
17	2, 10, 11	divcld 11925	. . . . . 6 ⊢ (𝜑 → (𝑌 / 𝑋) ∈ ℂ)
18	16, 17	remul2d 15183	. . . . 5 ⊢ (𝜑 → (ℜ‘((𝑍 / 𝑌) · (𝑌 / 𝑋))) = ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))))
19	15, 18	eqtr3d 2774	. . . 4 ⊢ (𝜑 → (ℜ‘(𝑍 / 𝑋)) = ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))))
20	19	eqeq1d 2739	. . 3 ⊢ (𝜑 → ((ℜ‘(𝑍 / 𝑋)) = 0 ↔ ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))) = 0))
21	1, 2, 4	divcld 11925	. . . 4 ⊢ (𝜑 → (𝑍 / 𝑌) ∈ ℂ)
22	17	recld 15150	. . . . 5 ⊢ (𝜑 → (ℜ‘(𝑌 / 𝑋)) ∈ ℝ)
23	22	recnd 11167	. . . 4 ⊢ (𝜑 → (ℜ‘(𝑌 / 𝑋)) ∈ ℂ)
24	21, 23	mul0ord 11792	. . 3 ⊢ (𝜑 → (((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))) = 0 ↔ ((𝑍 / 𝑌) = 0 ∨ (ℜ‘(𝑌 / 𝑋)) = 0)))
25	13, 20, 24	3bitrd 305	. 2 ⊢ (𝜑 → ((𝑋𝐹𝑍) ∈ {(π / 2), -(π / 2)} ↔ ((𝑍 / 𝑌) = 0 ∨ (ℜ‘(𝑌 / 𝑋)) = 0)))
26	8, 12, 25	3bitr4d 311	1 ⊢ (𝜑 → ((𝑋𝐹𝑌) ∈ {(π / 2), -(π / 2)} ↔ (𝑋𝐹𝑍) ∈ {(π / 2), -(π / 2)}))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∨ wo 848 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∖ cdif 3887 {csn 4568 {cpr 4570 ‘cfv 6493 (class class class)co 7361 ∈ cmpo 7363 ℂcc 11030 ℝcr 11031 0cc0 11032 · cmul 11037 -cneg 11372 / cdiv 11801 2c2 12230 ℜcre 15053 ℑcim 15054 πcpi 16025 logclog 26534

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5213 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 ax-inf2 9556 ax-cnex 11088 ax-resscn 11089 ax-1cn 11090 ax-icn 11091 ax-addcl 11092 ax-addrcl 11093 ax-mulcl 11094 ax-mulrcl 11095 ax-mulcom 11096 ax-addass 11097 ax-mulass 11098 ax-distr 11099 ax-i2m1 11100 ax-1ne0 11101 ax-1rid 11102 ax-rnegex 11103 ax-rrecex 11104 ax-cnre 11105 ax-pre-lttri 11106 ax-pre-lttrn 11107 ax-pre-ltadd 11108 ax-pre-mulgt0 11109 ax-pre-sup 11110 ax-addf 11111

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-tp 4573 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-iin 4937 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-se 5579 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-isom 6502 df-riota 7318 df-ov 7364 df-oprab 7365 df-mpo 7366 df-of 7625 df-om 7812 df-1st 7936 df-2nd 7937 df-supp 8105 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-1o 8399 df-2o 8400 df-er 8637 df-map 8769 df-pm 8770 df-ixp 8840 df-en 8888 df-dom 8889 df-sdom 8890 df-fin 8891 df-fsupp 9269 df-fi 9318 df-sup 9349 df-inf 9350 df-oi 9419 df-card 9857 df-pnf 11175 df-mnf 11176 df-xr 11177 df-ltxr 11178 df-le 11179 df-sub 11373 df-neg 11374 df-div 11802 df-nn 12169 df-2 12238 df-3 12239 df-4 12240 df-5 12241 df-6 12242 df-7 12243 df-8 12244 df-9 12245 df-n0 12432 df-z 12519 df-dec 12639 df-uz 12783 df-q 12893 df-rp 12937 df-xneg 13057 df-xadd 13058 df-xmul 13059 df-ioo 13296 df-ioc 13297 df-ico 13298 df-icc 13299 df-fz 13456 df-fzo 13603 df-fl 13745 df-mod 13823 df-seq 13958 df-exp 14018 df-fac 14230 df-bc 14259 df-hash 14287 df-shft 15023 df-cj 15055 df-re 15056 df-im 15057 df-sqrt 15191 df-abs 15192 df-limsup 15427 df-clim 15444 df-rlim 15445 df-sum 15643 df-ef 16026 df-sin 16028 df-cos 16029 df-pi 16031 df-struct 17111 df-sets 17128 df-slot 17146 df-ndx 17158 df-base 17174 df-ress 17195 df-plusg 17227 df-mulr 17228 df-starv 17229 df-sca 17230 df-vsca 17231 df-ip 17232 df-tset 17233 df-ple 17234 df-ds 17236 df-unif 17237 df-hom 17238 df-cco 17239 df-rest 17379 df-topn 17380 df-0g 17398 df-gsum 17399 df-topgen 17400 df-pt 17401 df-prds 17404 df-xrs 17460 df-qtop 17465 df-imas 17466 df-xps 17468 df-mre 17542 df-mrc 17543 df-acs 17545 df-mgm 18602 df-sgrp 18681 df-mnd 18697 df-submnd 18746 df-mulg 19038 df-cntz 19286 df-cmn 19751 df-psmet 21339 df-xmet 21340 df-met 21341 df-bl 21342 df-mopn 21343 df-fbas 21344 df-fg 21345 df-cnfld 21348 df-top 22872 df-topon 22889 df-topsp 22911 df-bases 22924 df-cld 22997 df-ntr 22998 df-cls 22999 df-nei 23076 df-lp 23114 df-perf 23115 df-cn 23205 df-cnp 23206 df-haus 23293 df-tx 23540 df-hmeo 23733 df-fil 23824 df-fm 23916 df-flim 23917 df-flf 23918 df-xms 24298 df-ms 24299 df-tms 24300 df-cncf 24858 df-limc 25846 df-dv 25847 df-log 26536

This theorem is referenced by: chordthmlem2 26813

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