Theorem lmodfopnelem1 14303

Description: Lemma 1 for lmodfopne 14305. (Contributed by AV, 2-Oct-2021.)

Hypotheses

Ref	Expression
lmodfopne.t	⊢ · = ( ·sf ‘𝑊)
lmodfopne.a	⊢ + = (+𝑓‘𝑊)
lmodfopne.v	⊢ 𝑉 = (Base‘𝑊)
lmodfopne.s	⊢ 𝑆 = (Scalar‘𝑊)
lmodfopne.k	⊢ 𝐾 = (Base‘𝑆)

Assertion

Ref	Expression
lmodfopnelem1	⊢ ((𝑊 ∈ LMod ∧ + = · ) → 𝑉 = 𝐾)

Proof of Theorem lmodfopnelem1

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		lmodfopne.v	. . . 4 ⊢ 𝑉 = (Base‘𝑊)
2		lmodfopne.a	. . . 4 ⊢ + = (+𝑓‘𝑊)
3	1, 2	plusffng 13413	. . 3 ⊢ (𝑊 ∈ LMod → + Fn (𝑉 × 𝑉))
4		lmodfopne.s	. . . 4 ⊢ 𝑆 = (Scalar‘𝑊)
5		lmodfopne.k	. . . 4 ⊢ 𝐾 = (Base‘𝑆)
6		lmodfopne.t	. . . 4 ⊢ · = ( ·sf ‘𝑊)
7	1, 4, 5, 6	scaffng 14288	. . 3 ⊢ (𝑊 ∈ LMod → · Fn (𝐾 × 𝑉))
8		fneq1 5409	. . . . . . . . . 10 ⊢ ( + = · → ( + Fn (𝑉 × 𝑉) ↔ · Fn (𝑉 × 𝑉)))
9		fndmu 5424	. . . . . . . . . . 11 ⊢ (( · Fn (𝑉 × 𝑉) ∧ · Fn (𝐾 × 𝑉)) → (𝑉 × 𝑉) = (𝐾 × 𝑉))
10	9	ex 115	. . . . . . . . . 10 ⊢ ( · Fn (𝑉 × 𝑉) → ( · Fn (𝐾 × 𝑉) → (𝑉 × 𝑉) = (𝐾 × 𝑉)))
11	8, 10	biimtrdi 163	. . . . . . . . 9 ⊢ ( + = · → ( + Fn (𝑉 × 𝑉) → ( · Fn (𝐾 × 𝑉) → (𝑉 × 𝑉) = (𝐾 × 𝑉))))
12	11	com13 80	. . . . . . . 8 ⊢ ( · Fn (𝐾 × 𝑉) → ( + Fn (𝑉 × 𝑉) → ( + = · → (𝑉 × 𝑉) = (𝐾 × 𝑉))))
13	12	impcom 125	. . . . . . 7 ⊢ (( + Fn (𝑉 × 𝑉) ∧ · Fn (𝐾 × 𝑉)) → ( + = · → (𝑉 × 𝑉) = (𝐾 × 𝑉)))
14		lmodgrp 14273	. . . . . . . . . . 11 ⊢ (𝑊 ∈ LMod → 𝑊 ∈ Grp)
15		eqid 2229	. . . . . . . . . . . 12 ⊢ (0g‘𝑊) = (0g‘𝑊)
16	1, 15	grpidcl 13577	. . . . . . . . . . 11 ⊢ (𝑊 ∈ Grp → (0g‘𝑊) ∈ 𝑉)
17		elex2 2816	. . . . . . . . . . 11 ⊢ ((0g‘𝑊) ∈ 𝑉 → ∃𝑤 𝑤 ∈ 𝑉)
18	14, 16, 17	3syl 17	. . . . . . . . . 10 ⊢ (𝑊 ∈ LMod → ∃𝑤 𝑤 ∈ 𝑉)
19		xp11m 5167	. . . . . . . . . 10 ⊢ ((∃𝑤 𝑤 ∈ 𝑉 ∧ ∃𝑤 𝑤 ∈ 𝑉) → ((𝑉 × 𝑉) = (𝐾 × 𝑉) ↔ (𝑉 = 𝐾 ∧ 𝑉 = 𝑉)))
20	18, 18, 19	syl2anc 411	. . . . . . . . 9 ⊢ (𝑊 ∈ LMod → ((𝑉 × 𝑉) = (𝐾 × 𝑉) ↔ (𝑉 = 𝐾 ∧ 𝑉 = 𝑉)))
21	20	simprbda 383	. . . . . . . 8 ⊢ ((𝑊 ∈ LMod ∧ (𝑉 × 𝑉) = (𝐾 × 𝑉)) → 𝑉 = 𝐾)
22	21	expcom 116	. . . . . . 7 ⊢ ((𝑉 × 𝑉) = (𝐾 × 𝑉) → (𝑊 ∈ LMod → 𝑉 = 𝐾))
23	13, 22	syl6 33	. . . . . 6 ⊢ (( + Fn (𝑉 × 𝑉) ∧ · Fn (𝐾 × 𝑉)) → ( + = · → (𝑊 ∈ LMod → 𝑉 = 𝐾)))
24	23	com23 78	. . . . 5 ⊢ (( + Fn (𝑉 × 𝑉) ∧ · Fn (𝐾 × 𝑉)) → (𝑊 ∈ LMod → ( + = · → 𝑉 = 𝐾)))
25	24	ex 115	. . . 4 ⊢ ( + Fn (𝑉 × 𝑉) → ( · Fn (𝐾 × 𝑉) → (𝑊 ∈ LMod → ( + = · → 𝑉 = 𝐾))))
26	25	com3r 79	. . 3 ⊢ (𝑊 ∈ LMod → ( + Fn (𝑉 × 𝑉) → ( · Fn (𝐾 × 𝑉) → ( + = · → 𝑉 = 𝐾))))
27	3, 7, 26	mp2d 47	. 2 ⊢ (𝑊 ∈ LMod → ( + = · → 𝑉 = 𝐾))
28	27	imp 124	1 ⊢ ((𝑊 ∈ LMod ∧ + = · ) → 𝑉 = 𝐾)

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1395  ∃wex 1538   ∈ wcel 2200   × cxp 4717   Fn wfn 5313  ‘cfv 5318  Basecbs 13047  Scalarcsca 13128  0_gc0g 13304  +_𝑓cplusf 13401  Grpcgrp 13548  LModclmod 14266   ·_sf cscaf 14267

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-cnex 8101  ax-resscn 8102  ax-1re 8104  ax-addrcl 8107

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-reu 2515  df-rmo 2516  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-riota 5960  df-ov 6010  df-oprab 6011  df-mpo 6012  df-1st 6292  df-2nd 6293  df-inn 9122  df-2 9180  df-3 9181  df-4 9182  df-5 9183  df-6 9184  df-ndx 13050  df-slot 13051  df-base 13053  df-plusg 13138  df-mulr 13139  df-sca 13141  df-vsca 13142  df-0g 13306  df-plusf 13403  df-mgm 13404  df-sgrp 13450  df-mnd 13465  df-grp 13551  df-lmod 14268  df-scaf 14269

This theorem is referenced by:  lmodfopnelem2  14304