angrtmuld - Metamath Proof Explorer

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Theorem angrtmuld 26745

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 11913	. . . 4 ⊢ (𝜑 → (𝑍 / 𝑌) ≠ 0)
6	5	neneqd 2933	. . 3 ⊢ (𝜑 → ¬ (𝑍 / 𝑌) = 0)
7		biorf 936	. . 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 26743	. 2 ⊢ (𝜑 → ((𝑋𝐹𝑌) ∈ {(π / 2), -(π / 2)} ↔ (ℜ‘(𝑌 / 𝑋)) = 0))
13	9, 10, 11, 1, 3	angrteqvd 26743	. . 3 ⊢ (𝜑 → ((𝑋𝐹𝑍) ∈ {(π / 2), -(π / 2)} ↔ (ℜ‘(𝑍 / 𝑋)) = 0))
14	1, 2, 10, 4, 11	dmdcan2d 11927	. . . . . 6 ⊢ (𝜑 → ((𝑍 / 𝑌) · (𝑌 / 𝑋)) = (𝑍 / 𝑋))
15	14	fveq2d 6826	. . . . 5 ⊢ (𝜑 → (ℜ‘((𝑍 / 𝑌) · (𝑌 / 𝑋))) = (ℜ‘(𝑍 / 𝑋)))
16		angrtmuld.7	. . . . . 6 ⊢ (𝜑 → (𝑍 / 𝑌) ∈ ℝ)
17	2, 10, 11	divcld 11897	. . . . . 6 ⊢ (𝜑 → (𝑌 / 𝑋) ∈ ℂ)
18	16, 17	remul2d 15134	. . . . 5 ⊢ (𝜑 → (ℜ‘((𝑍 / 𝑌) · (𝑌 / 𝑋))) = ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))))
19	15, 18	eqtr3d 2768	. . . 4 ⊢ (𝜑 → (ℜ‘(𝑍 / 𝑋)) = ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))))
20	19	eqeq1d 2733	. . 3 ⊢ (𝜑 → ((ℜ‘(𝑍 / 𝑋)) = 0 ↔ ((𝑍 / 𝑌) · (ℜ‘(𝑌 / 𝑋))) = 0))
21	1, 2, 4	divcld 11897	. . . 4 ⊢ (𝜑 → (𝑍 / 𝑌) ∈ ℂ)
22	17	recld 15101	. . . . 5 ⊢ (𝜑 → (ℜ‘(𝑌 / 𝑋)) ∈ ℝ)
23	22	recnd 11140	. . . 4 ⊢ (𝜑 → (ℜ‘(𝑌 / 𝑋)) ∈ ℂ)
24	21, 23	mul0ord 11765	. . 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 847 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 ∖ cdif 3894 {csn 4573 {cpr 4575 ‘cfv 6481 (class class class)co 7346 ∈ cmpo 7348 ℂcc 11004 ℝcr 11005 0cc0 11006 · cmul 11011 -cneg 11345 / cdiv 11774 2c2 12180 ℜcre 15004 ℑcim 15005 πcpi 15973 logclog 26490

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5215 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-inf2 9531 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 ax-pre-sup 11084 ax-addf 11085

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-tp 4578 df-op 4580 df-uni 4857 df-int 4896 df-iun 4941 df-iin 4942 df-br 5090 df-opab 5152 df-mpt 5171 df-tr 5197 df-id 5509 df-eprel 5514 df-po 5522 df-so 5523 df-fr 5567 df-se 5568 df-we 5569 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-isom 6490 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-of 7610 df-om 7797 df-1st 7921 df-2nd 7922 df-supp 8091 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-2o 8386 df-er 8622 df-map 8752 df-pm 8753 df-ixp 8822 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-fsupp 9246 df-fi 9295 df-sup 9326 df-inf 9327 df-oi 9396 df-card 9832 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-div 11775 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-uz 12733 df-q 12847 df-rp 12891 df-xneg 13011 df-xadd 13012 df-xmul 13013 df-ioo 13249 df-ioc 13250 df-ico 13251 df-icc 13252 df-fz 13408 df-fzo 13555 df-fl 13696 df-mod 13774 df-seq 13909 df-exp 13969 df-fac 14181 df-bc 14210 df-hash 14238 df-shft 14974 df-cj 15006 df-re 15007 df-im 15008 df-sqrt 15142 df-abs 15143 df-limsup 15378 df-clim 15395 df-rlim 15396 df-sum 15594 df-ef 15974 df-sin 15976 df-cos 15977 df-pi 15979 df-struct 17058 df-sets 17075 df-slot 17093 df-ndx 17105 df-base 17121 df-ress 17142 df-plusg 17174 df-mulr 17175 df-starv 17176 df-sca 17177 df-vsca 17178 df-ip 17179 df-tset 17180 df-ple 17181 df-ds 17183 df-unif 17184 df-hom 17185 df-cco 17186 df-rest 17326 df-topn 17327 df-0g 17345 df-gsum 17346 df-topgen 17347 df-pt 17348 df-prds 17351 df-xrs 17406 df-qtop 17411 df-imas 17412 df-xps 17414 df-mre 17488 df-mrc 17489 df-acs 17491 df-mgm 18548 df-sgrp 18627 df-mnd 18643 df-submnd 18692 df-mulg 18981 df-cntz 19229 df-cmn 19694 df-psmet 21283 df-xmet 21284 df-met 21285 df-bl 21286 df-mopn 21287 df-fbas 21288 df-fg 21289 df-cnfld 21292 df-top 22809 df-topon 22826 df-topsp 22848 df-bases 22861 df-cld 22934 df-ntr 22935 df-cls 22936 df-nei 23013 df-lp 23051 df-perf 23052 df-cn 23142 df-cnp 23143 df-haus 23230 df-tx 23477 df-hmeo 23670 df-fil 23761 df-fm 23853 df-flim 23854 df-flf 23855 df-xms 24235 df-ms 24236 df-tms 24237 df-cncf 24798 df-limc 25794 df-dv 25795 df-log 26492

This theorem is referenced by: chordthmlem2 26770

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