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Theorem xpsgrp 17357
 Description: The binary product of groups is a group. (Contributed by Mario Carneiro, 20-Aug-2015.)
Hypothesis
Ref Expression
xpsgrp.t 𝑇 = (𝑅 ×s 𝑆)
Assertion
Ref Expression
xpsgrp ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 𝑇 ∈ Grp)

Proof of Theorem xpsgrp
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 xpsgrp.t . . 3 𝑇 = (𝑅 ×s 𝑆)
2 eqid 2610 . . 3 (Base‘𝑅) = (Base‘𝑅)
3 eqid 2610 . . 3 (Base‘𝑆) = (Base‘𝑆)
4 simpl 472 . . 3 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 𝑅 ∈ Grp)
5 simpr 476 . . 3 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 𝑆 ∈ Grp)
6 eqid 2610 . . 3 (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) = (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦}))
7 eqid 2610 . . 3 (Scalar‘𝑅) = (Scalar‘𝑅)
8 eqid 2610 . . 3 ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})) = ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))
91, 2, 3, 4, 5, 6, 7, 8xpsval 16055 . 2 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 𝑇 = ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) “s ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))))
106xpsff1o2 16054 . . . . 5 (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→ran (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦}))
111, 2, 3, 4, 5, 6, 7, 8xpslem 16056 . . . . . 6 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ran (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) = (Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))))
12 f1oeq3 6042 . . . . . 6 (ran (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) = (Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) → ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→ran (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) ↔ (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))))
1311, 12syl 17 . . . . 5 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→ran (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) ↔ (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))))
1410, 13mpbii 222 . . . 4 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))))
15 f1ocnv 6062 . . . 4 ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):((Base‘𝑅) × (Base‘𝑆))–1-1-onto→(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) → (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))–1-1-onto→((Base‘𝑅) × (Base‘𝑆)))
16 f1of1 6049 . . . 4 ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))–1-1-onto→((Base‘𝑅) × (Base‘𝑆)) → (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))–1-1→((Base‘𝑅) × (Base‘𝑆)))
1714, 15, 163syl 18 . . 3 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → (𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))–1-1→((Base‘𝑅) × (Base‘𝑆)))
18 2on 7455 . . . . 5 2𝑜 ∈ On
1918a1i 11 . . . 4 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 2𝑜 ∈ On)
20 fvex 6113 . . . . 5 (Scalar‘𝑅) ∈ V
2120a1i 11 . . . 4 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → (Scalar‘𝑅) ∈ V)
22 xpscf 16049 . . . . 5 (({𝑅} +𝑐 {𝑆}):2𝑜⟶Grp ↔ (𝑅 ∈ Grp ∧ 𝑆 ∈ Grp))
2322biimpri 217 . . . 4 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ({𝑅} +𝑐 {𝑆}):2𝑜⟶Grp)
248, 19, 21, 23prdsgrpd 17348 . . 3 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})) ∈ Grp)
25 eqid 2610 . . . 4 ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) “s ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) = ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) “s ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))
26 eqid 2610 . . . 4 (Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) = (Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))
2725, 26imasgrpf1 17355 . . 3 (((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})):(Base‘((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})))–1-1→((Base‘𝑅) × (Base‘𝑆)) ∧ ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆})) ∈ Grp) → ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) “s ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) ∈ Grp)
2817, 24, 27syl2anc 691 . 2 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ((𝑥 ∈ (Base‘𝑅), 𝑦 ∈ (Base‘𝑆) ↦ ({𝑥} +𝑐 {𝑦})) “s ((Scalar‘𝑅)Xs({𝑅} +𝑐 {𝑆}))) ∈ Grp)
299, 28eqeltrd 2688 1 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → 𝑇 ∈ Grp)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977  Vcvv 3173  {csn 4125   × cxp 5036  ◡ccnv 5037  ran crn 5039  Oncon0 5640  ⟶wf 5800  –1-1→wf1 5801  –1-1-onto→wf1o 5803  ‘cfv 5804  (class class class)co 6549   ↦ cmpt2 6551  2𝑜c2o 7441   +𝑐 ccda 8872  Basecbs 15695  Scalarcsca 15771  Xscprds 15929   “s cimas 15987   ×s cxps 15989  Grpcgrp 17245 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-map 7746  df-ixp 7795  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-sup 8231  df-inf 8232  df-cda 8873  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-3 10957  df-4 10958  df-5 10959  df-6 10960  df-7 10961  df-8 10962  df-9 10963  df-n0 11170  df-z 11255  df-dec 11370  df-uz 11564  df-fz 12198  df-struct 15697  df-ndx 15698  df-slot 15699  df-base 15700  df-plusg 15781  df-mulr 15782  df-sca 15784  df-vsca 15785  df-ip 15786  df-tset 15787  df-ple 15788  df-ds 15791  df-hom 15793  df-cco 15794  df-0g 15925  df-prds 15931  df-imas 15991  df-xps 15993  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-grp 17248  df-minusg 17249 This theorem is referenced by: (None)
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