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Related theorems GIF version |
| Description: The integers under addition comprise a subgroup of the complex numbers under addition. (Contributed by Paul Chapman, 25-Apr-2008.) |
| Ref | Expression |
|---|---|
| zaddsubg | ⊢ ( + ↾ (ℤ × ℤ)) ∈ (SubGrp ‘ + ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnaddabl 8058 | . . 3 ⊢ + ∈ Abel | |
| 2 | ablgrp 8033 | . . 3 ⊢ ( + ∈ Abel → + ∈ Grp) | |
| 3 | 1, 2 | ax-mp 7 | . 2 ⊢ + ∈ Grp |
| 4 | axaddopr 5232 | . . . 4 ⊢ + :(ℂ × ℂ)–→ℂ | |
| 5 | fdm 3612 | . . . 4 ⊢ ( + :(ℂ × ℂ)–→ℂ → dom + = (ℂ × ℂ)) | |
| 6 | 4, 5 | ax-mp 7 | . . 3 ⊢ dom + = (ℂ × ℂ) |
| 7 | 3, 6 | grprn 7985 | . 2 ⊢ ℂ = ran + |
| 8 | cnid 8059 | . 2 ⊢ 0 = (Id ‘ + ) | |
| 9 | eqid 1467 | . 2 ⊢ (inv ‘ + ) = (inv ‘ + ) | |
| 10 | zsscn 6085 | . 2 ⊢ ℤ ⊆ ℂ | |
| 11 | eqid 1467 | . 2 ⊢ ( + ↾ (ℤ × ℤ)) = ( + ↾ (ℤ × ℤ)) | |
| 12 | zaddclt 6107 | . 2 ⊢ ((x ∈ ℤ ⋀ y ∈ ℤ) → (x + y) ∈ ℤ) | |
| 13 | 0z 6088 | . 2 ⊢ 0 ∈ ℤ | |
| 14 | zcnt 6082 | . . . 4 ⊢ (x ∈ ℤ → x ∈ ℂ) | |
| 15 | addinv 8060 | . . . 4 ⊢ (x ∈ ℂ → ((inv ‘ + ) ‘x) = -x) | |
| 16 | 14, 15 | syl 10 | . . 3 ⊢ (x ∈ ℤ → ((inv ‘ + ) ‘x) = -x) |
| 17 | znegclt 6105 | . . 3 ⊢ (x ∈ ℤ → -x ∈ ℤ) | |
| 18 | 16, 17 | eqeltrd 1539 | . 2 ⊢ (x ∈ ℤ → ((inv ‘ + ) ‘x) ∈ ℤ) |
| 19 | 3, 7, 8, 9, 10, 11, 12, 13, 18 | issubgi 8054 | 1 ⊢ ( + ↾ (ℤ × ℤ)) ∈ (SubGrp ‘ + ) |
| Colors of variables: wff set class |
| Syntax hints: = wceq 953 ∈ wcel 955 × cxp 3155 dom cdm 3157 ↾ cres 3159 –→wf 3165 ‘cfv 3169 ℂcc 5199 0cc0 5201 + caddc 5204 -cneg 5260 ℤcz 5265 Grpcgr 7962 invcgn 7964 Abelcabl 8030 SubGrpcsubg 8046 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-9 962 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1451 ax-rep 2682 ax-sep 2692 ax-nul 2699 ax-pow 2731 ax-pr 2768 ax-un 2854 ax-inf2 4592 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 774 df-3an 775 df-ex 978 df-sb 1168 df-eu 1374 df-mo 1375 df-clab 1456 df-cleq 1461 df-clel 1464 df-ne 1578 df-nel 1579 df-ral 1640 df-rex 1641 df-reu 1642 df-rab 1643 df-v 1802 df-sbc 1931 df-csb 1991 df-dif 2038 df-un 2039 df-in 2040 df-ss 2042 df-pss 2044 df-nul 2270 df-if 2351 df-pw 2391 df-sn 2401 df-pr 2402 df-tp 2404 df-op 2405 df-uni 2493 df-int 2523 df-iun 2557 df-br 2609 df-opab 2656 df-tr 2670 df-eprel 2818 df-id 2821 df-po 2828 df-so 2838 df-fr 2904 df-we 2921 df-ord 2938 df-on 2939 df-lim 2940 df-suc 2941 df-om 3119 df-xp 3171 df-rel 3172 df-cnv 3173 df-co 3174 df-dm 3175 df-rn 3176 df-res 3177 df-ima 3178 df-fun 3179 df-fn 3180 df-f 3181 df-f1 3182 df-fo 3183 df-f1o 3184 df-fv 3185 df-rdg 3912 df-opr 3945 df-oprab 3946 df-1st 4058 df-2nd 4059 df-1o 4112 df-oadd 4114 df-omul 4115 df-er 4240 df-ec 4242 df-qs 4245 df-en 4346 df-dom 4347 df-sdom 4348 df-ni 4967 df-pli 4968 df-mi 4969 df-lti 4970 df-plpq 5002 df-mpq 5003 df-enq 5004 df-nq 5005 df-plq 5006 df-mq 5007 df-rq 5008 df-ltq 5009 df-1q 5010 df-np 5053 df-1p 5054 df-plp 5055 df-mp 5056 df-ltp 5057 df-plpr 5131 df-mpr 5132 df-enr 5133 df-nr 5134 df-plr 5135 df-mr 5136 df-ltr 5137 df-0r 5138 df-1r 5139 df-m1r 5140 df-c 5207 df-0 5208 df-1 5209 df-i 5210 df-r 5211 df-plus 5212 df-mul 5213 df-lt 5214 df-sub 5323 df-neg 5325 df-pnf 5454 df-mnf 5455 df-xr 5456 df-ltxr 5457 df-le 5458 df-n 5868 df-n0 6042 df-z 6078 df-grp 7966 df-gid 7967 df-ginv 7968 df-abl 8031 df-subg 8047 |