Theorem lmodfopnelem1 14633

Description: Lemma 1 for lmodfopne 14635. (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 13662	. . 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 14618	. . 3 ⊢ (𝑊 ∈ LMod → · Fn (𝐾 × 𝑉))
8		fneq1 5464	. . . . . . . . . 10 ⊢ ( + = · → ( + Fn (𝑉 × 𝑉) ↔ · Fn (𝑉 × 𝑉)))
9		fndmu 5479	. . . . . . . . . . 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 14603	. . . . . . . . . . 11 ⊢ (𝑊 ∈ LMod → 𝑊 ∈ Grp)
15		eqid 2238	. . . . . . . . . . . 12 ⊢ (0g‘𝑊) = (0g‘𝑊)
16	1, 15	grpidcl 13811	. . . . . . . . . . 11 ⊢ (𝑊 ∈ Grp → (0g‘𝑊) ∈ 𝑉)
17		elex2 2838	. . . . . . . . . . 11 ⊢ ((0g‘𝑊) ∈ 𝑉 → ∃𝑤 𝑤 ∈ 𝑉)
18	14, 16, 17	3syl 17	. . . . . . . . . 10 ⊢ (𝑊 ∈ LMod → ∃𝑤 𝑤 ∈ 𝑉)
19		xp11m 5221	. . . . . . . . . 10 ⊢ ((∃𝑤 𝑤 ∈ 𝑉 ∧ ∃𝑤 𝑤 ∈ 𝑉) → ((𝑉 × 𝑉) = (𝐾 × 𝑉) ↔ (𝑉 = 𝐾 ∧ 𝑉 = 𝑉)))
20	18, 18, 19	syl2anc 415	. . . . . . . . 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 1402  ∃wex 1545   ∈ wcel 2209   × cxp 4767   Fn wfn 5367  ‘cfv 5372  Basecbs 13330  Scalarcsca 13411  0_gc0g 13587  +_𝑓cplusf 13650  Grpcgrp 13782  LModclmod 14596   ·_sf cscaf 14597

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-cnex 8260  ax-resscn 8261  ax-1re 8263  ax-addrcl 8266

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-inn 9284  df-2 9342  df-3 9343  df-4 9344  df-5 9345  df-6 9346  df-ndx 13333  df-slot 13334  df-base 13336  df-plusg 13421  df-mulr 13422  df-sca 13424  df-vsca 13425  df-0g 13589  df-plusf 13652  df-mgm 13653  df-sgrp 13694  df-mnd 13707  df-grp 13785  df-lmod 14598  df-scaf 14599

This theorem is referenced by:  lmodfopnelem2  14634