mrsubcn - Mathbox for Mario Carneiro

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Theorem mrsubcn 33481

Description: A substitution does not change the value of constant substrings. (Contributed by Mario Carneiro, 18-Jul-2016.)

**Hypotheses**
Ref	Expression
mrsubccat.s	⊢ 𝑆 = (mRSubst‘𝑇)
mrsubccat.r	⊢ 𝑅 = (mREx‘𝑇)
mrsubcn.v	⊢ 𝑉 = (mVR‘𝑇)
mrsubcn.c	⊢ 𝐶 = (mCN‘𝑇)

**Assertion**
Ref	Expression
mrsubcn	⊢ ((𝐹 ∈ ran 𝑆 ∧ 𝑋 ∈ (𝐶 ∖ 𝑉)) → (𝐹‘⟨“𝑋”⟩) = ⟨“𝑋”⟩)

Proof of Theorem mrsubcn Dummy variable 𝑓 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		n0i 4267	. . . . 5 ⊢ (𝐹 ∈ ran 𝑆 → ¬ ran 𝑆 = ∅)
2		mrsubccat.s	. . . . . 6 ⊢ 𝑆 = (mRSubst‘𝑇)
3	2	rnfvprc 6768	. . . . 5 ⊢ (¬ 𝑇 ∈ V → ran 𝑆 = ∅)
4	1, 3	nsyl2 141	. . . 4 ⊢ (𝐹 ∈ ran 𝑆 → 𝑇 ∈ V)
5		mrsubcn.v	. . . . 5 ⊢ 𝑉 = (mVR‘𝑇)
6		mrsubccat.r	. . . . 5 ⊢ 𝑅 = (mREx‘𝑇)
7	5, 6, 2	mrsubff 33474	. . . 4 ⊢ (𝑇 ∈ V → 𝑆:(𝑅 ↑_pm 𝑉)⟶(𝑅 ↑_m 𝑅))
8		ffun 6603	. . . 4 ⊢ (𝑆:(𝑅 ↑_pm 𝑉)⟶(𝑅 ↑_m 𝑅) → Fun 𝑆)
9	4, 7, 8	3syl 18	. . 3 ⊢ (𝐹 ∈ ran 𝑆 → Fun 𝑆)
10	5, 6, 2	mrsubrn 33475	. . . . 5 ⊢ ran 𝑆 = (𝑆 “ (𝑅 ↑_m 𝑉))
11	10	eleq2i 2830	. . . 4 ⊢ (𝐹 ∈ ran 𝑆 ↔ 𝐹 ∈ (𝑆 “ (𝑅 ↑_m 𝑉)))
12	11	biimpi 215	. . 3 ⊢ (𝐹 ∈ ran 𝑆 → 𝐹 ∈ (𝑆 “ (𝑅 ↑_m 𝑉)))
13		fvelima 6835	. . 3 ⊢ ((Fun 𝑆 ∧ 𝐹 ∈ (𝑆 “ (𝑅 ↑_m 𝑉))) → ∃𝑓 ∈ (𝑅 ↑_m 𝑉)(𝑆‘𝑓) = 𝐹)
14	9, 12, 13	syl2anc 584	. 2 ⊢ (𝐹 ∈ ran 𝑆 → ∃𝑓 ∈ (𝑅 ↑_m 𝑉)(𝑆‘𝑓) = 𝐹)
15		elmapi 8637	. . . . . . 7 ⊢ (𝑓 ∈ (𝑅 ↑_m 𝑉) → 𝑓:𝑉⟶𝑅)
16	15	adantl 482	. . . . . 6 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → 𝑓:𝑉⟶𝑅)
17		ssidd 3944	. . . . . 6 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → 𝑉 ⊆ 𝑉)
18		eldifi 4061	. . . . . . . 8 ⊢ (𝑋 ∈ (𝐶 ∖ 𝑉) → 𝑋 ∈ 𝐶)
19		elun1 4110	. . . . . . . 8 ⊢ (𝑋 ∈ 𝐶 → 𝑋 ∈ (𝐶 ∪ 𝑉))
20	18, 19	syl 17	. . . . . . 7 ⊢ (𝑋 ∈ (𝐶 ∖ 𝑉) → 𝑋 ∈ (𝐶 ∪ 𝑉))
21	20	adantr 481	. . . . . 6 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → 𝑋 ∈ (𝐶 ∪ 𝑉))
22		mrsubcn.c	. . . . . . 7 ⊢ 𝐶 = (mCN‘𝑇)
23	22, 5, 6, 2	mrsubcv 33472	. . . . . 6 ⊢ ((𝑓:𝑉⟶𝑅 ∧ 𝑉 ⊆ 𝑉 ∧ 𝑋 ∈ (𝐶 ∪ 𝑉)) → ((𝑆‘𝑓)‘⟨“𝑋”⟩) = if(𝑋 ∈ 𝑉, (𝑓‘𝑋), ⟨“𝑋”⟩))
24	16, 17, 21, 23	syl3anc 1370	. . . . 5 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → ((𝑆‘𝑓)‘⟨“𝑋”⟩) = if(𝑋 ∈ 𝑉, (𝑓‘𝑋), ⟨“𝑋”⟩))
25		eldifn 4062	. . . . . . 7 ⊢ (𝑋 ∈ (𝐶 ∖ 𝑉) → ¬ 𝑋 ∈ 𝑉)
26	25	adantr 481	. . . . . 6 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → ¬ 𝑋 ∈ 𝑉)
27	26	iffalsed 4470	. . . . 5 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → if(𝑋 ∈ 𝑉, (𝑓‘𝑋), ⟨“𝑋”⟩) = ⟨“𝑋”⟩)
28	24, 27	eqtrd 2778	. . . 4 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → ((𝑆‘𝑓)‘⟨“𝑋”⟩) = ⟨“𝑋”⟩)
29		fveq1 6773	. . . . 5 ⊢ ((𝑆‘𝑓) = 𝐹 → ((𝑆‘𝑓)‘⟨“𝑋”⟩) = (𝐹‘⟨“𝑋”⟩))
30	29	eqeq1d 2740	. . . 4 ⊢ ((𝑆‘𝑓) = 𝐹 → (((𝑆‘𝑓)‘⟨“𝑋”⟩) = ⟨“𝑋”⟩ ↔ (𝐹‘⟨“𝑋”⟩) = ⟨“𝑋”⟩))
31	28, 30	syl5ibcom 244	. . 3 ⊢ ((𝑋 ∈ (𝐶 ∖ 𝑉) ∧ 𝑓 ∈ (𝑅 ↑_m 𝑉)) → ((𝑆‘𝑓) = 𝐹 → (𝐹‘⟨“𝑋”⟩) = ⟨“𝑋”⟩))
32	31	rexlimdva 3213	. 2 ⊢ (𝑋 ∈ (𝐶 ∖ 𝑉) → (∃𝑓 ∈ (𝑅 ↑_m 𝑉)(𝑆‘𝑓) = 𝐹 → (𝐹‘⟨“𝑋”⟩) = ⟨“𝑋”⟩))
33	14, 32	mpan9 507	1 ⊢ ((𝐹 ∈ ran 𝑆 ∧ 𝑋 ∈ (𝐶 ∖ 𝑉)) → (𝐹‘⟨“𝑋”⟩) = ⟨“𝑋”⟩)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ∃wrex 3065 Vcvv 3432 ∖ cdif 3884 ∪ cun 3885 ⊆ wss 3887 ∅c0 4256 ifcif 4459 ran crn 5590 “ cima 5592 Fun wfun 6427 ⟶wf 6429 ‘cfv 6433 (class class class)co 7275 ↑_m cmap 8615 ↑_pm cpm 8616 ⟨“cs1 14300 mCNcmcn 33422 mVRcmvar 33423 mRExcmrex 33428 mRSubstcmrsub 33432

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 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 2709 ax-rep 5209 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-er 8498 df-map 8617 df-pm 8618 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-2 12036 df-n0 12234 df-z 12320 df-uz 12583 df-fz 13240 df-fzo 13383 df-seq 13722 df-hash 14045 df-word 14218 df-concat 14274 df-s1 14301 df-struct 16848 df-sets 16865 df-slot 16883 df-ndx 16895 df-base 16913 df-ress 16942 df-plusg 16975 df-0g 17152 df-gsum 17153 df-mgm 18326 df-sgrp 18375 df-mnd 18386 df-submnd 18431 df-frmd 18488 df-mrex 33448 df-mrsub 33452

This theorem is referenced by: elmrsubrn 33482 mrsubco 33483 mrsubvrs 33484

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