Users' Mathboxes Mathbox for Jeff Madsen < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  grpokerinj Structured version   Visualization version   GIF version

Theorem grpokerinj 33822
Description: A group homomorphism is injective if and only if its kernel is zero. (Contributed by Jeff Madsen, 16-Jun-2011.)
Hypotheses
Ref Expression
grpkerinj.1 𝑋 = ran 𝐺
grpkerinj.2 𝑊 = (GId‘𝐺)
grpkerinj.3 𝑌 = ran 𝐻
grpkerinj.4 𝑈 = (GId‘𝐻)
Assertion
Ref Expression
grpokerinj ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹:𝑋1-1𝑌 ↔ (𝐹 “ {𝑈}) = {𝑊}))

Proof of Theorem grpokerinj
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 grpkerinj.2 . . . . . . . . 9 𝑊 = (GId‘𝐺)
2 grpkerinj.4 . . . . . . . . 9 𝑈 = (GId‘𝐻)
31, 2ghomidOLD 33818 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹𝑊) = 𝑈)
43sneqd 4222 . . . . . . 7 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {(𝐹𝑊)} = {𝑈})
5 grpkerinj.1 . . . . . . . . . 10 𝑋 = ran 𝐺
6 grpkerinj.3 . . . . . . . . . 10 𝑌 = ran 𝐻
75, 6ghomf 33819 . . . . . . . . 9 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝐹:𝑋𝑌)
8 ffn 6083 . . . . . . . . 9 (𝐹:𝑋𝑌𝐹 Fn 𝑋)
97, 8syl 17 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝐹 Fn 𝑋)
105, 1grpoidcl 27496 . . . . . . . . 9 (𝐺 ∈ GrpOp → 𝑊𝑋)
11103ad2ant1 1102 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝑊𝑋)
12 fnsnfv 6297 . . . . . . . 8 ((𝐹 Fn 𝑋𝑊𝑋) → {(𝐹𝑊)} = (𝐹 “ {𝑊}))
139, 11, 12syl2anc 694 . . . . . . 7 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {(𝐹𝑊)} = (𝐹 “ {𝑊}))
144, 13eqtr3d 2687 . . . . . 6 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {𝑈} = (𝐹 “ {𝑊}))
1514imaeq2d 5501 . . . . 5 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹 “ {𝑈}) = (𝐹 “ (𝐹 “ {𝑊})))
1615adantl 481 . . . 4 ((𝐹:𝑋1-1𝑌 ∧ (𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻))) → (𝐹 “ {𝑈}) = (𝐹 “ (𝐹 “ {𝑊})))
1710snssd 4372 . . . . . 6 (𝐺 ∈ GrpOp → {𝑊} ⊆ 𝑋)
18173ad2ant1 1102 . . . . 5 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {𝑊} ⊆ 𝑋)
19 f1imacnv 6191 . . . . 5 ((𝐹:𝑋1-1𝑌 ∧ {𝑊} ⊆ 𝑋) → (𝐹 “ (𝐹 “ {𝑊})) = {𝑊})
2018, 19sylan2 490 . . . 4 ((𝐹:𝑋1-1𝑌 ∧ (𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻))) → (𝐹 “ (𝐹 “ {𝑊})) = {𝑊})
2116, 20eqtrd 2685 . . 3 ((𝐹:𝑋1-1𝑌 ∧ (𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻))) → (𝐹 “ {𝑈}) = {𝑊})
2221expcom 450 . 2 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹:𝑋1-1𝑌 → (𝐹 “ {𝑈}) = {𝑊}))
237adantr 480 . . . 4 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → 𝐹:𝑋𝑌)
24 simpl2 1085 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → 𝐻 ∈ GrpOp)
257ffvelrnda 6399 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ 𝑥𝑋) → (𝐹𝑥) ∈ 𝑌)
2625adantrr 753 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝑥) ∈ 𝑌)
277ffvelrnda 6399 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ 𝑦𝑋) → (𝐹𝑦) ∈ 𝑌)
2827adantrl 752 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝑦) ∈ 𝑌)
29 eqid 2651 . . . . . . . . 9 ( /𝑔𝐻) = ( /𝑔𝐻)
306, 2, 29grpoeqdivid 33810 . . . . . . . 8 ((𝐻 ∈ GrpOp ∧ (𝐹𝑥) ∈ 𝑌 ∧ (𝐹𝑦) ∈ 𝑌) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
3124, 26, 28, 30syl3anc 1366 . . . . . . 7 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
3231adantlr 751 . . . . . 6 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
33 eqid 2651 . . . . . . . . . 10 ( /𝑔𝐺) = ( /𝑔𝐺)
345, 33, 29ghomdiv 33821 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹‘(𝑥( /𝑔𝐺)𝑦)) = ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)))
3534adantlr 751 . . . . . . . 8 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹‘(𝑥( /𝑔𝐺)𝑦)) = ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)))
3635eqeq1d 2653 . . . . . . 7 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) = 𝑈 ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
37 fvex 6239 . . . . . . . . . . 11 (GId‘𝐻) ∈ V
382, 37eqeltri 2726 . . . . . . . . . 10 𝑈 ∈ V
3938snid 4241 . . . . . . . . 9 𝑈 ∈ {𝑈}
40 eleq1 2718 . . . . . . . . 9 ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) = 𝑈 → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ 𝑈 ∈ {𝑈}))
4139, 40mpbiri 248 . . . . . . . 8 ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) = 𝑈 → (𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈})
42 ffun 6086 . . . . . . . . . . . . . 14 (𝐹:𝑋𝑌 → Fun 𝐹)
437, 42syl 17 . . . . . . . . . . . . 13 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → Fun 𝐹)
4443adantr 480 . . . . . . . . . . . 12 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → Fun 𝐹)
455, 33grpodivcl 27521 . . . . . . . . . . . . . . 15 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
46453expb 1285 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
47463ad2antl1 1243 . . . . . . . . . . . . 13 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
48 fdm 6089 . . . . . . . . . . . . . . 15 (𝐹:𝑋𝑌 → dom 𝐹 = 𝑋)
497, 48syl 17 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → dom 𝐹 = 𝑋)
5049adantr 480 . . . . . . . . . . . . 13 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → dom 𝐹 = 𝑋)
5147, 50eleqtrrd 2733 . . . . . . . . . . . 12 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ dom 𝐹)
52 fvimacnv 6372 . . . . . . . . . . . 12 ((Fun 𝐹 ∧ (𝑥( /𝑔𝐺)𝑦) ∈ dom 𝐹) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈})))
5344, 51, 52syl2anc 694 . . . . . . . . . . 11 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈})))
54 eleq2 2719 . . . . . . . . . . 11 ((𝐹 “ {𝑈}) = {𝑊} → ((𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈}) ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
5553, 54sylan9bb 736 . . . . . . . . . 10 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
5655an32s 863 . . . . . . . . 9 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
57 elsni 4227 . . . . . . . . . . 11 ((𝑥( /𝑔𝐺)𝑦) ∈ {𝑊} → (𝑥( /𝑔𝐺)𝑦) = 𝑊)
585, 1, 33grpoeqdivid 33810 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → (𝑥 = 𝑦 ↔ (𝑥( /𝑔𝐺)𝑦) = 𝑊))
5958biimprd 238 . . . . . . . . . . . . 13 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → ((𝑥( /𝑔𝐺)𝑦) = 𝑊𝑥 = 𝑦))
60593expb 1285 . . . . . . . . . . . 12 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥( /𝑔𝐺)𝑦) = 𝑊𝑥 = 𝑦))
61603ad2antl1 1243 . . . . . . . . . . 11 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥( /𝑔𝐺)𝑦) = 𝑊𝑥 = 𝑦))
6257, 61syl5 34 . . . . . . . . . 10 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥( /𝑔𝐺)𝑦) ∈ {𝑊} → 𝑥 = 𝑦))
6362adantlr 751 . . . . . . . . 9 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥( /𝑔𝐺)𝑦) ∈ {𝑊} → 𝑥 = 𝑦))
6456, 63sylbid 230 . . . . . . . 8 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} → 𝑥 = 𝑦))
6541, 64syl5 34 . . . . . . 7 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) = 𝑈𝑥 = 𝑦))
6636, 65sylbird 250 . . . . . 6 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → (((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈𝑥 = 𝑦))
6732, 66sylbid 230 . . . . 5 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦))
6867ralrimivva 3000 . . . 4 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → ∀𝑥𝑋𝑦𝑋 ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦))
69 dff13 6552 . . . 4 (𝐹:𝑋1-1𝑌 ↔ (𝐹:𝑋𝑌 ∧ ∀𝑥𝑋𝑦𝑋 ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦)))
7023, 68, 69sylanbrc 699 . . 3 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → 𝐹:𝑋1-1𝑌)
7170ex 449 . 2 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → ((𝐹 “ {𝑈}) = {𝑊} → 𝐹:𝑋1-1𝑌))
7222, 71impbid 202 1 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹:𝑋1-1𝑌 ↔ (𝐹 “ {𝑈}) = {𝑊}))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1054   = wceq 1523  wcel 2030  wral 2941  Vcvv 3231  wss 3607  {csn 4210  ccnv 5142  dom cdm 5143  ran crn 5144  cima 5146  Fun wfun 5920   Fn wfn 5921  wf 5922  1-1wf1 5923  cfv 5926  (class class class)co 6690  GrpOpcgr 27471  GIdcgi 27472   /𝑔 cgs 27474   GrpOpHom cghomOLD 33812
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-1st 7210  df-2nd 7211  df-grpo 27475  df-gid 27476  df-ginv 27477  df-gdiv 27478  df-ghomOLD 33813
This theorem is referenced by:  rngokerinj  33904
  Copyright terms: Public domain W3C validator