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Theorem grpokerinj 34005
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 34001 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹𝑊) = 𝑈)
43sneqd 4333 . . . . . . 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 34002 . . . . . . . . 9 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝐹:𝑋𝑌)
8 ffn 6206 . . . . . . . . 9 (𝐹:𝑋𝑌𝐹 Fn 𝑋)
97, 8syl 17 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝐹 Fn 𝑋)
105, 1grpoidcl 27677 . . . . . . . . 9 (𝐺 ∈ GrpOp → 𝑊𝑋)
11103ad2ant1 1128 . . . . . . . 8 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → 𝑊𝑋)
12 fnsnfv 6420 . . . . . . . 8 ((𝐹 Fn 𝑋𝑊𝑋) → {(𝐹𝑊)} = (𝐹 “ {𝑊}))
139, 11, 12syl2anc 696 . . . . . . 7 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {(𝐹𝑊)} = (𝐹 “ {𝑊}))
144, 13eqtr3d 2796 . . . . . 6 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {𝑈} = (𝐹 “ {𝑊}))
1514imaeq2d 5624 . . . . 5 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → (𝐹 “ {𝑈}) = (𝐹 “ (𝐹 “ {𝑊})))
1615adantl 473 . . . 4 ((𝐹:𝑋1-1𝑌 ∧ (𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻))) → (𝐹 “ {𝑈}) = (𝐹 “ (𝐹 “ {𝑊})))
1710snssd 4485 . . . . . 6 (𝐺 ∈ GrpOp → {𝑊} ⊆ 𝑋)
18173ad2ant1 1128 . . . . 5 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → {𝑊} ⊆ 𝑋)
19 f1imacnv 6314 . . . . 5 ((𝐹:𝑋1-1𝑌 ∧ {𝑊} ⊆ 𝑋) → (𝐹 “ (𝐹 “ {𝑊})) = {𝑊})
2018, 19sylan2 492 . . . 4 ((𝐹:𝑋1-1𝑌 ∧ (𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻))) → (𝐹 “ (𝐹 “ {𝑊})) = {𝑊})
2116, 20eqtrd 2794 . . 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 472 . . . 4 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → 𝐹:𝑋𝑌)
24 simpl2 1230 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → 𝐻 ∈ GrpOp)
257ffvelrnda 6522 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ 𝑥𝑋) → (𝐹𝑥) ∈ 𝑌)
2625adantrr 755 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝑥) ∈ 𝑌)
277ffvelrnda 6522 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ 𝑦𝑋) → (𝐹𝑦) ∈ 𝑌)
2827adantrl 754 . . . . . . . 8 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹𝑦) ∈ 𝑌)
29 eqid 2760 . . . . . . . . 9 ( /𝑔𝐻) = ( /𝑔𝐻)
306, 2, 29grpoeqdivid 33993 . . . . . . . 8 ((𝐻 ∈ GrpOp ∧ (𝐹𝑥) ∈ 𝑌 ∧ (𝐹𝑦) ∈ 𝑌) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
3124, 26, 28, 30syl3anc 1477 . . . . . . 7 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
3231adantlr 753 . . . . . 6 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹𝑥) = (𝐹𝑦) ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
33 eqid 2760 . . . . . . . . . 10 ( /𝑔𝐺) = ( /𝑔𝐺)
345, 33, 29ghomdiv 34004 . . . . . . . . 9 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹‘(𝑥( /𝑔𝐺)𝑦)) = ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)))
3534adantlr 753 . . . . . . . 8 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → (𝐹‘(𝑥( /𝑔𝐺)𝑦)) = ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)))
3635eqeq1d 2762 . . . . . . 7 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) = 𝑈 ↔ ((𝐹𝑥)( /𝑔𝐻)(𝐹𝑦)) = 𝑈))
37 fvex 6362 . . . . . . . . . . 11 (GId‘𝐻) ∈ V
382, 37eqeltri 2835 . . . . . . . . . 10 𝑈 ∈ V
3938snid 4353 . . . . . . . . 9 𝑈 ∈ {𝑈}
40 eleq1 2827 . . . . . . . . 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 6209 . . . . . . . . . . . . . 14 (𝐹:𝑋𝑌 → Fun 𝐹)
437, 42syl 17 . . . . . . . . . . . . 13 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → Fun 𝐹)
4443adantr 472 . . . . . . . . . . . 12 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → Fun 𝐹)
455, 33grpodivcl 27702 . . . . . . . . . . . . . . 15 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
46453expb 1114 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
47463ad2antl1 1201 . . . . . . . . . . . . 13 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ 𝑋)
48 fdm 6212 . . . . . . . . . . . . . . 15 (𝐹:𝑋𝑌 → dom 𝐹 = 𝑋)
497, 48syl 17 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) → dom 𝐹 = 𝑋)
5049adantr 472 . . . . . . . . . . . . 13 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → dom 𝐹 = 𝑋)
5147, 50eleqtrrd 2842 . . . . . . . . . . . 12 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → (𝑥( /𝑔𝐺)𝑦) ∈ dom 𝐹)
52 fvimacnv 6495 . . . . . . . . . . . 12 ((Fun 𝐹 ∧ (𝑥( /𝑔𝐺)𝑦) ∈ dom 𝐹) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈})))
5344, 51, 52syl2anc 696 . . . . . . . . . . 11 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈})))
54 eleq2 2828 . . . . . . . . . . 11 ((𝐹 “ {𝑈}) = {𝑊} → ((𝑥( /𝑔𝐺)𝑦) ∈ (𝐹 “ {𝑈}) ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
5553, 54sylan9bb 738 . . . . . . . . . 10 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝑥𝑋𝑦𝑋)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
5655an32s 881 . . . . . . . . 9 ((((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) ∧ (𝑥𝑋𝑦𝑋)) → ((𝐹‘(𝑥( /𝑔𝐺)𝑦)) ∈ {𝑈} ↔ (𝑥( /𝑔𝐺)𝑦) ∈ {𝑊}))
57 elsni 4338 . . . . . . . . . . 11 ((𝑥( /𝑔𝐺)𝑦) ∈ {𝑊} → (𝑥( /𝑔𝐺)𝑦) = 𝑊)
585, 1, 33grpoeqdivid 33993 . . . . . . . . . . . . . 14 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → (𝑥 = 𝑦 ↔ (𝑥( /𝑔𝐺)𝑦) = 𝑊))
5958biimprd 238 . . . . . . . . . . . . 13 ((𝐺 ∈ GrpOp ∧ 𝑥𝑋𝑦𝑋) → ((𝑥( /𝑔𝐺)𝑦) = 𝑊𝑥 = 𝑦))
60593expb 1114 . . . . . . . . . . . 12 ((𝐺 ∈ GrpOp ∧ (𝑥𝑋𝑦𝑋)) → ((𝑥( /𝑔𝐺)𝑦) = 𝑊𝑥 = 𝑦))
61603ad2antl1 1201 . . . . . . . . . . 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 753 . . . . . . . . 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 3109 . . . 4 (((𝐺 ∈ GrpOp ∧ 𝐻 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐻)) ∧ (𝐹 “ {𝑈}) = {𝑊}) → ∀𝑥𝑋𝑦𝑋 ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦))
69 dff13 6675 . . . 4 (𝐹:𝑋1-1𝑌 ↔ (𝐹:𝑋𝑌 ∧ ∀𝑥𝑋𝑦𝑋 ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦)))
7023, 68, 69sylanbrc 701 . . 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 1072   = wceq 1632  wcel 2139  wral 3050  Vcvv 3340  wss 3715  {csn 4321  ccnv 5265  dom cdm 5266  ran crn 5267  cima 5269  Fun wfun 6043   Fn wfn 6044  wf 6045  1-1wf1 6046  cfv 6049  (class class class)co 6813  GrpOpcgr 27652  GIdcgi 27653   /𝑔 cgs 27655   GrpOpHom cghomOLD 33995
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7114
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-riota 6774  df-ov 6816  df-oprab 6817  df-mpt2 6818  df-1st 7333  df-2nd 7334  df-grpo 27656  df-gid 27657  df-ginv 27658  df-gdiv 27659  df-ghomOLD 33996
This theorem is referenced by:  rngokerinj  34087
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