Theorem lmodfopnelem1 14344

Description: Lemma 1 for lmodfopne 14346. (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 13453	. . 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 14329	. . 3 ⊢ (𝑊 ∈ LMod → · Fn (𝐾 × 𝑉))
8		fneq1 5418	. . . . . . . . . 10 ⊢ ( + = · → ( + Fn (𝑉 × 𝑉) ↔ · Fn (𝑉 × 𝑉)))
9		fndmu 5433	. . . . . . . . . . 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 14314	. . . . . . . . . . 11 ⊢ (𝑊 ∈ LMod → 𝑊 ∈ Grp)
15		eqid 2231	. . . . . . . . . . . 12 ⊢ (0g‘𝑊) = (0g‘𝑊)
16	1, 15	grpidcl 13617	. . . . . . . . . . 11 ⊢ (𝑊 ∈ Grp → (0g‘𝑊) ∈ 𝑉)
17		elex2 2819	. . . . . . . . . . 11 ⊢ ((0g‘𝑊) ∈ 𝑉 → ∃𝑤 𝑤 ∈ 𝑉)
18	14, 16, 17	3syl 17	. . . . . . . . . 10 ⊢ (𝑊 ∈ LMod → ∃𝑤 𝑤 ∈ 𝑉)
19		xp11m 5175	. . . . . . . . . 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 1397  ∃wex 1540   ∈ wcel 2202   × cxp 4723   Fn wfn 5321  ‘cfv 5326  Basecbs 13087  Scalarcsca 13168  0_gc0g 13344  +_𝑓cplusf 13441  Grpcgrp 13588  LModclmod 14307   ·_sf cscaf 14308

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-cnex 8123  ax-resscn 8124  ax-1re 8126  ax-addrcl 8129

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5971  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-inn 9144  df-2 9202  df-3 9203  df-4 9204  df-5 9205  df-6 9206  df-ndx 13090  df-slot 13091  df-base 13093  df-plusg 13178  df-mulr 13179  df-sca 13181  df-vsca 13182  df-0g 13346  df-plusf 13443  df-mgm 13444  df-sgrp 13490  df-mnd 13505  df-grp 13591  df-lmod 14309  df-scaf 14310

This theorem is referenced by:  lmodfopnelem2  14345