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| Mirrors > Home > MPE Home > Th. List > pzriprngALT | Structured version Visualization version GIF version | ||
| Description: The non-unital ring (ℤring ×s ℤring) is unital because it has the two-sided ideal (ℤ × {0}), which is unital, and the quotient of the ring and the ideal is also unital (using ring2idlqusb 21282). (Contributed by AV, 23-Mar-2025.) (Proof modification is discouraged.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| pzriprngALT | ⊢ (ℤring ×s ℤring) ∈ Ring |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | oveq2 7378 | . . . . . 6 ⊢ (𝑖 = (ℤ × {0}) → ((ℤring ×s ℤring) ↾s 𝑖) = ((ℤring ×s ℤring) ↾s (ℤ × {0}))) | |
| 2 | 1 | eleq1d 2822 | . . . . 5 ⊢ (𝑖 = (ℤ × {0}) → (((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ↔ ((ℤring ×s ℤring) ↾s (ℤ × {0})) ∈ Ring)) |
| 3 | oveq2 7378 | . . . . . . 7 ⊢ (𝑖 = (ℤ × {0}) → ((ℤring ×s ℤring) ~QG 𝑖) = ((ℤring ×s ℤring) ~QG (ℤ × {0}))) | |
| 4 | 3 | oveq2d 7386 | . . . . . 6 ⊢ (𝑖 = (ℤ × {0}) → ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) = ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0})))) |
| 5 | 4 | eleq1d 2822 | . . . . 5 ⊢ (𝑖 = (ℤ × {0}) → (((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring ↔ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) ∈ Ring)) |
| 6 | 2, 5 | anbi12d 633 | . . . 4 ⊢ (𝑖 = (ℤ × {0}) → ((((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring) ↔ (((ℤring ×s ℤring) ↾s (ℤ × {0})) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) ∈ Ring))) |
| 7 | eqid 2737 | . . . . . 6 ⊢ (ℤring ×s ℤring) = (ℤring ×s ℤring) | |
| 8 | eqid 2737 | . . . . . 6 ⊢ (ℤ × {0}) = (ℤ × {0}) | |
| 9 | eqid 2737 | . . . . . 6 ⊢ ((ℤring ×s ℤring) ↾s (ℤ × {0})) = ((ℤring ×s ℤring) ↾s (ℤ × {0})) | |
| 10 | 7, 8, 9 | pzriprnglem8 21460 | . . . . 5 ⊢ (ℤ × {0}) ∈ (2Ideal‘(ℤring ×s ℤring)) |
| 11 | 10 | a1i 11 | . . . 4 ⊢ (⊤ → (ℤ × {0}) ∈ (2Ideal‘(ℤring ×s ℤring))) |
| 12 | 7, 8, 9 | pzriprnglem7 21459 | . . . . . 6 ⊢ ((ℤring ×s ℤring) ↾s (ℤ × {0})) ∈ Ring |
| 13 | 12 | a1i 11 | . . . . 5 ⊢ (⊤ → ((ℤring ×s ℤring) ↾s (ℤ × {0})) ∈ Ring) |
| 14 | eqid 2737 | . . . . . 6 ⊢ (1r‘((ℤring ×s ℤring) ↾s (ℤ × {0}))) = (1r‘((ℤring ×s ℤring) ↾s (ℤ × {0}))) | |
| 15 | eqid 2737 | . . . . . 6 ⊢ ((ℤring ×s ℤring) ~QG (ℤ × {0})) = ((ℤring ×s ℤring) ~QG (ℤ × {0})) | |
| 16 | eqid 2737 | . . . . . 6 ⊢ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) = ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) | |
| 17 | 7, 8, 9, 14, 15, 16 | pzriprnglem13 21465 | . . . . 5 ⊢ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) ∈ Ring |
| 18 | 13, 17 | jctir 520 | . . . 4 ⊢ (⊤ → (((ℤring ×s ℤring) ↾s (ℤ × {0})) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG (ℤ × {0}))) ∈ Ring)) |
| 19 | 6, 11, 18 | rspcedvdw 3581 | . . 3 ⊢ (⊤ → ∃𝑖 ∈ (2Ideal‘(ℤring ×s ℤring))(((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring)) |
| 20 | 19 | mptru 1549 | . 2 ⊢ ∃𝑖 ∈ (2Ideal‘(ℤring ×s ℤring))(((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring) |
| 21 | 7 | pzriprnglem1 21453 | . . 3 ⊢ (ℤring ×s ℤring) ∈ Rng |
| 22 | ring2idlqusb 21282 | . . 3 ⊢ ((ℤring ×s ℤring) ∈ Rng → ((ℤring ×s ℤring) ∈ Ring ↔ ∃𝑖 ∈ (2Ideal‘(ℤring ×s ℤring))(((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring))) | |
| 23 | 21, 22 | ax-mp 5 | . 2 ⊢ ((ℤring ×s ℤring) ∈ Ring ↔ ∃𝑖 ∈ (2Ideal‘(ℤring ×s ℤring))(((ℤring ×s ℤring) ↾s 𝑖) ∈ Ring ∧ ((ℤring ×s ℤring) /s ((ℤring ×s ℤring) ~QG 𝑖)) ∈ Ring)) |
| 24 | 20, 23 | mpbir 231 | 1 ⊢ (ℤring ×s ℤring) ∈ Ring |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 ∃wrex 3062 {csn 4582 × cxp 5632 ‘cfv 6502 (class class class)co 7370 0cc0 11040 ℤcz 12502 ↾s cress 17171 /s cqus 17440 ×s cxps 17441 ~QG cqg 19069 Rngcrng 20104 1rcur 20133 Ringcrg 20185 2Idealc2idl 21221 ℤringczring 21418 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-cnex 11096 ax-resscn 11097 ax-1cn 11098 ax-icn 11099 ax-addcl 11100 ax-addrcl 11101 ax-mulcl 11102 ax-mulrcl 11103 ax-mulcom 11104 ax-addass 11105 ax-mulass 11106 ax-distr 11107 ax-i2m1 11108 ax-1ne0 11109 ax-1rid 11110 ax-rnegex 11111 ax-rrecex 11112 ax-cnre 11113 ax-pre-lttri 11114 ax-pre-lttrn 11115 ax-pre-ltadd 11116 ax-pre-mulgt0 11117 ax-addf 11119 ax-mulf 11120 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5529 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5587 df-we 5589 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-ord 6330 df-on 6331 df-lim 6332 df-suc 6333 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-riota 7327 df-ov 7373 df-oprab 7374 df-mpo 7375 df-om 7821 df-1st 7945 df-2nd 7946 df-tpos 8180 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-rdg 8353 df-1o 8409 df-2o 8410 df-er 8647 df-ec 8649 df-qs 8653 df-map 8779 df-ixp 8850 df-en 8898 df-dom 8899 df-sdom 8900 df-fin 8901 df-sup 9359 df-inf 9360 df-pnf 11182 df-mnf 11183 df-xr 11184 df-ltxr 11185 df-le 11186 df-sub 11380 df-neg 11381 df-nn 12160 df-2 12222 df-3 12223 df-4 12224 df-5 12225 df-6 12226 df-7 12227 df-8 12228 df-9 12229 df-n0 12416 df-z 12503 df-dec 12622 df-uz 12766 df-fz 13438 df-struct 17088 df-sets 17105 df-slot 17123 df-ndx 17135 df-base 17151 df-ress 17172 df-plusg 17204 df-mulr 17205 df-starv 17206 df-sca 17207 df-vsca 17208 df-ip 17209 df-tset 17210 df-ple 17211 df-ds 17213 df-unif 17214 df-hom 17215 df-cco 17216 df-0g 17375 df-prds 17381 df-imas 17443 df-qus 17444 df-xps 17445 df-mgm 18579 df-mgmhm 18631 df-sgrp 18658 df-mnd 18674 df-grp 18883 df-minusg 18884 df-sbg 18885 df-subg 19070 df-nsg 19071 df-eqg 19072 df-ghm 19159 df-cmn 19728 df-abl 19729 df-mgp 20093 df-rng 20105 df-ur 20134 df-ring 20187 df-cring 20188 df-oppr 20290 df-dvdsr 20310 df-unit 20311 df-invr 20341 df-rnghm 20389 df-rngim 20390 df-subrng 20496 df-subrg 20520 df-lmod 20830 df-lss 20900 df-sra 21142 df-rgmod 21143 df-lidl 21180 df-2idl 21222 df-cnfld 21327 df-zring 21419 |
| This theorem is referenced by: (None) |
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