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| Mirrors > Home > MPE Home > Th. List > drngmuleq0 | Structured version Visualization version GIF version | ||
| Description: An element is zero iff its product with a nonzero element is zero. (Contributed by NM, 8-Oct-2014.) |
| Ref | Expression |
|---|---|
| drngmuleq0.b | ⊢ 𝐵 = (Base‘𝑅) |
| drngmuleq0.o | ⊢ 0 = (0g‘𝑅) |
| drngmuleq0.t | ⊢ · = (.r‘𝑅) |
| drngmuleq0.r | ⊢ (𝜑 → 𝑅 ∈ DivRing) |
| drngmuleq0.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
| drngmuleq0.y | ⊢ (𝜑 → 𝑌 ∈ 𝐵) |
| drngmuleq0.e | ⊢ (𝜑 → 𝑌 ≠ 0 ) |
| Ref | Expression |
|---|---|
| drngmuleq0 | ⊢ (𝜑 → ((𝑋 · 𝑌) = 0 ↔ 𝑋 = 0 )) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | drngmuleq0.b | . . 3 ⊢ 𝐵 = (Base‘𝑅) | |
| 2 | drngmuleq0.o | . . 3 ⊢ 0 = (0g‘𝑅) | |
| 3 | drngmuleq0.t | . . 3 ⊢ · = (.r‘𝑅) | |
| 4 | drngmuleq0.r | . . 3 ⊢ (𝜑 → 𝑅 ∈ DivRing) | |
| 5 | drngmuleq0.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
| 6 | drngmuleq0.y | . . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵) | |
| 7 | 1, 2, 3, 4, 5, 6 | drngmul0or 21023 | . 2 ⊢ (𝜑 → ((𝑋 · 𝑌) = 0 ↔ (𝑋 = 0 ∨ 𝑌 = 0 ))) |
| 8 | drngmuleq0.e | . . 3 ⊢ (𝜑 → 𝑌 ≠ 0 ) | |
| 9 | df-ne 2956 | . . . 4 ⊢ (𝑌 ≠ 0 ↔ ¬ 𝑌 = 0 ) | |
| 10 | orel2 904 | . . . . 5 ⊢ (¬ 𝑌 = 0 → ((𝑋 = 0 ∨ 𝑌 = 0 ) → 𝑋 = 0 )) | |
| 11 | orc 881 | . . . . 5 ⊢ (𝑋 = 0 → (𝑋 = 0 ∨ 𝑌 = 0 )) | |
| 12 | 10, 11 | impbid1 228 | . . . 4 ⊢ (¬ 𝑌 = 0 → ((𝑋 = 0 ∨ 𝑌 = 0 ) ↔ 𝑋 = 0 )) |
| 13 | 9, 12 | sylbi 220 | . . 3 ⊢ (𝑌 ≠ 0 → ((𝑋 = 0 ∨ 𝑌 = 0 ) ↔ 𝑋 = 0 )) |
| 14 | 8, 13 | syl 18 | . 2 ⊢ (𝜑 → ((𝑋 = 0 ∨ 𝑌 = 0 ) ↔ 𝑋 = 0 )) |
| 15 | 7, 14 | bitrd 282 | 1 ⊢ (𝜑 → ((𝑋 · 𝑌) = 0 ↔ 𝑋 = 0 )) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∨ wo 861 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 ‘cfv 6538 (class class class)co 7420 Basecbs 17392 .rcmulr 17434 0gc0g 17615 DivRingcdr 20985 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11259 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 ax-pre-mulgt0 11280 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-tpos 8246 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-er 8720 df-en 8977 df-dom 8978 df-sdom 8979 df-pnf 11348 df-mnf 11349 df-xr 11350 df-ltxr 11351 df-le 11352 df-sub 11546 df-neg 11547 df-nn 12339 df-2 12408 df-3 12409 df-sets 17347 df-slot 17365 df-ndx 17377 df-base 17393 df-ress 17414 df-plusg 17446 df-mulr 17447 df-0g 17617 df-mgm 18821 df-sgrp 18913 df-mnd 18929 df-grp 19152 df-minusg 19153 df-cmn 20001 df-abl 20002 df-mgp 20366 df-rng 20380 df-ur 20413 df-ring 20466 df-oppr 20572 df-dvdsr 20592 df-unit 20593 df-invr 20623 df-nzr 20768 df-rlreg 20951 df-domn 20952 df-drng 20987 |
| This theorem is used by: lkrsc 40247 |
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