Theorem lmod0rng 41868

Description: If the scalar ring of a module is the zero ring, the module is the zero module, i.e. the base set of the module is the singleton consisting of the identity element only. (Contributed by AV, 17-Apr-2019.)

Assertion

Ref	Expression
lmod0rng	⊢ ((𝑀 ∈ LMod ∧ ¬ (Scalar‘𝑀) ∈ NzRing) → (Base‘𝑀) = {(0g‘𝑀)})

Proof of Theorem lmod0rng

Dummy variable 𝑣 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2622	. . . 4 ⊢ (Scalar‘𝑀) = (Scalar‘𝑀)
2	1	lmodring 18871	. . 3 ⊢ (𝑀 ∈ LMod → (Scalar‘𝑀) ∈ Ring)
3		0ringnnzr 19269	. . . . 5 ⊢ ((Scalar‘𝑀) ∈ Ring → ((#‘(Base‘(Scalar‘𝑀))) = 1 ↔ ¬ (Scalar‘𝑀) ∈ NzRing))
4		eqid 2622	. . . . . . . 8 ⊢ (Base‘(Scalar‘𝑀)) = (Base‘(Scalar‘𝑀))
5		eqid 2622	. . . . . . . 8 ⊢ (0g‘(Scalar‘𝑀)) = (0g‘(Scalar‘𝑀))
6		eqid 2622	. . . . . . . 8 ⊢ (1r‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀))
7	4, 5, 6	0ring01eq 19271	. . . . . . 7 ⊢ (((Scalar‘𝑀) ∈ Ring ∧ (#‘(Base‘(Scalar‘𝑀))) = 1) → (0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)))
8		eqid 2622	. . . . . . . . . . . . . 14 ⊢ (Base‘𝑀) = (Base‘𝑀)
9		eqid 2622	. . . . . . . . . . . . . 14 ⊢ ( ·𝑠 ‘𝑀) = ( ·𝑠 ‘𝑀)
10	8, 1, 9, 6	lmodvs1 18891	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) → ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = 𝑣)
11		eqcom 2629	. . . . . . . . . . . . . . . 16 ⊢ (((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = 𝑣 ↔ 𝑣 = ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣))
12	11	biimpi 206	. . . . . . . . . . . . . . 15 ⊢ (((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = 𝑣 → 𝑣 = ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣))
13		oveq1 6657	. . . . . . . . . . . . . . . . 17 ⊢ ((1r‘(Scalar‘𝑀)) = (0g‘(Scalar‘𝑀)) → ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = ((0g‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣))
14	13	eqcoms 2630	. . . . . . . . . . . . . . . 16 ⊢ ((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) → ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = ((0g‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣))
15		eqid 2622	. . . . . . . . . . . . . . . . 17 ⊢ (0g‘𝑀) = (0g‘𝑀)
16	8, 1, 9, 5, 15	lmod0vs 18896	. . . . . . . . . . . . . . . 16 ⊢ ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) → ((0g‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = (0g‘𝑀))
17	14, 16	sylan9eqr 2678	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) ∧ (0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀))) → ((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = (0g‘𝑀))
18	12, 17	sylan9eq 2676	. . . . . . . . . . . . . 14 ⊢ ((((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = 𝑣 ∧ ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) ∧ (0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)))) → 𝑣 = (0g‘𝑀))
19	18	exp32 631	. . . . . . . . . . . . 13 ⊢ (((1r‘(Scalar‘𝑀))( ·𝑠 ‘𝑀)𝑣) = 𝑣 → ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) → ((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) → 𝑣 = (0g‘𝑀))))
20	10, 19	mpcom 38	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) → ((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) → 𝑣 = (0g‘𝑀)))
21	20	com12 32	. . . . . . . . . . 11 ⊢ ((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) → ((𝑀 ∈ LMod ∧ 𝑣 ∈ (Base‘𝑀)) → 𝑣 = (0g‘𝑀)))
22	21	impl 650	. . . . . . . . . 10 ⊢ ((((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) ∧ 𝑀 ∈ LMod) ∧ 𝑣 ∈ (Base‘𝑀)) → 𝑣 = (0g‘𝑀))
23	22	ralrimiva 2966	. . . . . . . . 9 ⊢ (((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) ∧ 𝑀 ∈ LMod) → ∀𝑣 ∈ (Base‘𝑀)𝑣 = (0g‘𝑀))
24	8	lmodbn0 18873	. . . . . . . . . . 11 ⊢ (𝑀 ∈ LMod → (Base‘𝑀) ≠ ∅)
25		eqsn 4361	. . . . . . . . . . 11 ⊢ ((Base‘𝑀) ≠ ∅ → ((Base‘𝑀) = {(0g‘𝑀)} ↔ ∀𝑣 ∈ (Base‘𝑀)𝑣 = (0g‘𝑀)))
26	24, 25	syl 17	. . . . . . . . . 10 ⊢ (𝑀 ∈ LMod → ((Base‘𝑀) = {(0g‘𝑀)} ↔ ∀𝑣 ∈ (Base‘𝑀)𝑣 = (0g‘𝑀)))
27	26	adantl 482	. . . . . . . . 9 ⊢ (((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) ∧ 𝑀 ∈ LMod) → ((Base‘𝑀) = {(0g‘𝑀)} ↔ ∀𝑣 ∈ (Base‘𝑀)𝑣 = (0g‘𝑀)))
28	23, 27	mpbird 247	. . . . . . . 8 ⊢ (((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) ∧ 𝑀 ∈ LMod) → (Base‘𝑀) = {(0g‘𝑀)})
29	28	ex 450	. . . . . . 7 ⊢ ((0g‘(Scalar‘𝑀)) = (1r‘(Scalar‘𝑀)) → (𝑀 ∈ LMod → (Base‘𝑀) = {(0g‘𝑀)}))
30	7, 29	syl 17	. . . . . 6 ⊢ (((Scalar‘𝑀) ∈ Ring ∧ (#‘(Base‘(Scalar‘𝑀))) = 1) → (𝑀 ∈ LMod → (Base‘𝑀) = {(0g‘𝑀)}))
31	30	ex 450	. . . . 5 ⊢ ((Scalar‘𝑀) ∈ Ring → ((#‘(Base‘(Scalar‘𝑀))) = 1 → (𝑀 ∈ LMod → (Base‘𝑀) = {(0g‘𝑀)})))
32	3, 31	sylbird 250	. . . 4 ⊢ ((Scalar‘𝑀) ∈ Ring → (¬ (Scalar‘𝑀) ∈ NzRing → (𝑀 ∈ LMod → (Base‘𝑀) = {(0g‘𝑀)})))
33	32	com23 86	. . 3 ⊢ ((Scalar‘𝑀) ∈ Ring → (𝑀 ∈ LMod → (¬ (Scalar‘𝑀) ∈ NzRing → (Base‘𝑀) = {(0g‘𝑀)})))
34	2, 33	mpcom 38	. 2 ⊢ (𝑀 ∈ LMod → (¬ (Scalar‘𝑀) ∈ NzRing → (Base‘𝑀) = {(0g‘𝑀)}))
35	34	imp 445	1 ⊢ ((𝑀 ∈ LMod ∧ ¬ (Scalar‘𝑀) ∈ NzRing) → (Base‘𝑀) = {(0g‘𝑀)})

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1483   ∈ wcel 1990   ≠ wne 2794  ∀wral 2912  ∅c0 3915  {csn 4177  ‘cfv 5888  (class class class)co 6650  1c1 9937  #chash 13117  Basecbs 15857  Scalarcsca 15944   ·_𝑠 cvsca 15945  0_gc0g 16100  1_rcur 18501  Ringcrg 18547  LModclmod 18863  NzRingcnzr 19257

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-cda 8990  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-n0 11293  df-xnn0 11364  df-z 11378  df-uz 11688  df-fz 12327  df-hash 13118  df-ndx 15860  df-slot 15861  df-base 15863  df-sets 15864  df-plusg 15954  df-0g 16102  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-grp 17425  df-minusg 17426  df-mgp 18490  df-ur 18502  df-ring 18549  df-lmod 18865  df-nzr 19258

This theorem is referenced by: (None)