Theorem issubassa3 21170

Description: A subring that is also a subspace is a subalgebra. The key theorem is islss3 20319. (Contributed by Mario Carneiro, 7-Jan-2015.)

Hypotheses

Ref	Expression
issubassa.s	⊢ 𝑆 = (𝑊 ↾s 𝐴)
issubassa.l	⊢ 𝐿 = (LSubSp‘𝑊)

Assertion

Ref	Expression
issubassa3	⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝑆 ∈ AssAlg)

Proof of Theorem issubassa3

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		issubassa.s	. . . 4 ⊢ 𝑆 = (𝑊 ↾s 𝐴)
2	1	subrgbas 20130	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑊) → 𝐴 = (Base‘𝑆))
3	2	ad2antrl 725	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝐴 = (Base‘𝑆))
4		eqid 2736	. . . 4 ⊢ (Scalar‘𝑊) = (Scalar‘𝑊)
5	1, 4	resssca 17142	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑊) → (Scalar‘𝑊) = (Scalar‘𝑆))
6	5	ad2antrl 725	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (Scalar‘𝑊) = (Scalar‘𝑆))
7		eqidd 2737	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊)))
8		eqid 2736	. . . 4 ⊢ ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑊)
9	1, 8	ressvsca 17143	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑊) → ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑆))
10	9	ad2antrl 725	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → ( ·𝑠 ‘𝑊) = ( ·𝑠 ‘𝑆))
11		eqid 2736	. . . 4 ⊢ (.r‘𝑊) = (.r‘𝑊)
12	1, 11	ressmulr 17106	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑊) → (.r‘𝑊) = (.r‘𝑆))
13	12	ad2antrl 725	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (.r‘𝑊) = (.r‘𝑆))
14		assalmod 21165	. . 3 ⊢ (𝑊 ∈ AssAlg → 𝑊 ∈ LMod)
15		simpr 485	. . 3 ⊢ ((𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿) → 𝐴 ∈ 𝐿)
16		issubassa.l	. . . 4 ⊢ 𝐿 = (LSubSp‘𝑊)
17	1, 16	lsslmod 20320	. . 3 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝐿) → 𝑆 ∈ LMod)
18	14, 15, 17	syl2an 596	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝑆 ∈ LMod)
19	1	subrgring 20124	. . 3 ⊢ (𝐴 ∈ (SubRing‘𝑊) → 𝑆 ∈ Ring)
20	19	ad2antrl 725	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝑆 ∈ Ring)
21	4	assasca 21167	. . 3 ⊢ (𝑊 ∈ AssAlg → (Scalar‘𝑊) ∈ CRing)
22	21	adantr 481	. 2 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (Scalar‘𝑊) ∈ CRing)
23		idd 24	. . . . 5 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (𝑥 ∈ (Base‘(Scalar‘𝑊)) → 𝑥 ∈ (Base‘(Scalar‘𝑊))))
24		eqid 2736	. . . . . . . 8 ⊢ (Base‘𝑊) = (Base‘𝑊)
25	24	subrgss 20122	. . . . . . 7 ⊢ (𝐴 ∈ (SubRing‘𝑊) → 𝐴 ⊆ (Base‘𝑊))
26	25	ad2antrl 725	. . . . . 6 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝐴 ⊆ (Base‘𝑊))
27	26	sseld 3930	. . . . 5 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (𝑦 ∈ 𝐴 → 𝑦 ∈ (Base‘𝑊)))
28	26	sseld 3930	. . . . 5 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → (𝑧 ∈ 𝐴 → 𝑧 ∈ (Base‘𝑊)))
29	23, 27, 28	3anim123d 1442	. . . 4 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → ((𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊))))
30	29	imp 407	. . 3 ⊢ (((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊)))
31		eqid 2736	. . . . 5 ⊢ (Base‘(Scalar‘𝑊)) = (Base‘(Scalar‘𝑊))
32	24, 4, 31, 8, 11	assaass 21163	. . . 4 ⊢ ((𝑊 ∈ AssAlg ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊))) → ((𝑥( ·𝑠 ‘𝑊)𝑦)(.r‘𝑊)𝑧) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
33	32	adantlr 712	. . 3 ⊢ (((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊))) → ((𝑥( ·𝑠 ‘𝑊)𝑦)(.r‘𝑊)𝑧) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
34	30, 33	syldan 591	. 2 ⊢ (((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → ((𝑥( ·𝑠 ‘𝑊)𝑦)(.r‘𝑊)𝑧) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
35	24, 4, 31, 8, 11	assaassr 21164	. . . 4 ⊢ ((𝑊 ∈ AssAlg ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊))) → (𝑦(.r‘𝑊)(𝑥( ·𝑠 ‘𝑊)𝑧)) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
36	35	adantlr 712	. . 3 ⊢ (((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ (Base‘𝑊) ∧ 𝑧 ∈ (Base‘𝑊))) → (𝑦(.r‘𝑊)(𝑥( ·𝑠 ‘𝑊)𝑧)) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
37	30, 36	syldan 591	. 2 ⊢ (((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) ∧ (𝑥 ∈ (Base‘(Scalar‘𝑊)) ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → (𝑦(.r‘𝑊)(𝑥( ·𝑠 ‘𝑊)𝑧)) = (𝑥( ·𝑠 ‘𝑊)(𝑦(.r‘𝑊)𝑧)))
38	3, 6, 7, 10, 13, 18, 20, 22, 34, 37	isassad 21169	1 ⊢ ((𝑊 ∈ AssAlg ∧ (𝐴 ∈ (SubRing‘𝑊) ∧ 𝐴 ∈ 𝐿)) → 𝑆 ∈ AssAlg)

Syntax hints:   → wi 4   ∧ wa 396   ∧ w3a 1086   = wceq 1540   ∈ wcel 2105   ⊆ wss 3897  ‘cfv 6473  (class class class)co 7329  Basecbs 17001   ↾_s cress 17030  ._rcmulr 17052  Scalarcsca 17054   ·_𝑠 cvsca 17055  Ringcrg 19870  CRingccrg 19871  SubRingcsubrg 20117  LModclmod 20221  LSubSpclss 20291  AssAlgcasa 21155

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-sep 5240  ax-nul 5247  ax-pow 5305  ax-pr 5369  ax-un 7642  ax-cnex 11020  ax-resscn 11021  ax-1cn 11022  ax-icn 11023  ax-addcl 11024  ax-addrcl 11025  ax-mulcl 11026  ax-mulrcl 11027  ax-mulcom 11028  ax-addass 11029  ax-mulass 11030  ax-distr 11031  ax-i2m1 11032  ax-1ne0 11033  ax-1rid 11034  ax-rnegex 11035  ax-rrecex 11036  ax-cnre 11037  ax-pre-lttri 11038  ax-pre-lttrn 11039  ax-pre-ltadd 11040  ax-pre-mulgt0 11041

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-ne 2941  df-nel 3047  df-ral 3062  df-rex 3071  df-rmo 3349  df-reu 3350  df-rab 3404  df-v 3443  df-sbc 3727  df-csb 3843  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-pss 3916  df-nul 4269  df-if 4473  df-pw 4548  df-sn 4573  df-pr 4575  df-op 4579  df-uni 4852  df-iun 4940  df-br 5090  df-opab 5152  df-mpt 5173  df-tr 5207  df-id 5512  df-eprel 5518  df-po 5526  df-so 5527  df-fr 5569  df-we 5571  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-pred 6232  df-ord 6299  df-on 6300  df-lim 6301  df-suc 6302  df-iota 6425  df-fun 6475  df-fn 6476  df-f 6477  df-f1 6478  df-fo 6479  df-f1o 6480  df-fv 6481  df-riota 7286  df-ov 7332  df-oprab 7333  df-mpo 7334  df-om 7773  df-1st 7891  df-2nd 7892  df-frecs 8159  df-wrecs 8190  df-recs 8264  df-rdg 8303  df-er 8561  df-en 8797  df-dom 8798  df-sdom 8799  df-pnf 11104  df-mnf 11105  df-xr 11106  df-ltxr 11107  df-le 11108  df-sub 11300  df-neg 11301  df-nn 12067  df-2 12129  df-3 12130  df-4 12131  df-5 12132  df-6 12133  df-sets 16954  df-slot 16972  df-ndx 16984  df-base 17002  df-ress 17031  df-plusg 17064  df-mulr 17065  df-sca 17067  df-vsca 17068  df-0g 17241  df-mgm 18415  df-sgrp 18464  df-mnd 18475  df-grp 18668  df-minusg 18669  df-sbg 18670  df-subg 18840  df-mgp 19808  df-ur 19825  df-ring 19872  df-subrg 20119  df-lmod 20223  df-lss 20292  df-assa 21158

This theorem is referenced by:  issubassa  21171  rnasclassa  21197