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Theorem rrgeq0i 20038
 Description: Property of a left-regular element. (Contributed by Stefan O'Rear, 22-Mar-2015.)
Hypotheses
Ref Expression
rrgval.e 𝐸 = (RLReg‘𝑅)
rrgval.b 𝐵 = (Base‘𝑅)
rrgval.t · = (.r𝑅)
rrgval.z 0 = (0g𝑅)
Assertion
Ref Expression
rrgeq0i ((𝑋𝐸𝑌𝐵) → ((𝑋 · 𝑌) = 0𝑌 = 0 ))

Proof of Theorem rrgeq0i
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 rrgval.e . . . 4 𝐸 = (RLReg‘𝑅)
2 rrgval.b . . . 4 𝐵 = (Base‘𝑅)
3 rrgval.t . . . 4 · = (.r𝑅)
4 rrgval.z . . . 4 0 = (0g𝑅)
51, 2, 3, 4isrrg 20037 . . 3 (𝑋𝐸 ↔ (𝑋𝐵 ∧ ∀𝑦𝐵 ((𝑋 · 𝑦) = 0𝑦 = 0 )))
65simprbi 499 . 2 (𝑋𝐸 → ∀𝑦𝐵 ((𝑋 · 𝑦) = 0𝑦 = 0 ))
7 oveq2 7141 . . . . 5 (𝑦 = 𝑌 → (𝑋 · 𝑦) = (𝑋 · 𝑌))
87eqeq1d 2822 . . . 4 (𝑦 = 𝑌 → ((𝑋 · 𝑦) = 0 ↔ (𝑋 · 𝑌) = 0 ))
9 eqeq1 2824 . . . 4 (𝑦 = 𝑌 → (𝑦 = 0𝑌 = 0 ))
108, 9imbi12d 347 . . 3 (𝑦 = 𝑌 → (((𝑋 · 𝑦) = 0𝑦 = 0 ) ↔ ((𝑋 · 𝑌) = 0𝑌 = 0 )))
1110rspcv 3597 . 2 (𝑌𝐵 → (∀𝑦𝐵 ((𝑋 · 𝑦) = 0𝑦 = 0 ) → ((𝑋 · 𝑌) = 0𝑌 = 0 )))
126, 11mpan9 509 1 ((𝑋𝐸𝑌𝐵) → ((𝑋 · 𝑌) = 0𝑌 = 0 ))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  ∀wral 3125  ‘cfv 6331  (class class class)co 7133  Basecbs 16462  .rcmulr 16545  0gc0g 16692  RLRegcrlreg 20028 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-sep 5179  ax-nul 5186  ax-pow 5242  ax-pr 5306 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ral 3130  df-rex 3131  df-rab 3134  df-v 3475  df-sbc 3753  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4270  df-if 4444  df-sn 4544  df-pr 4546  df-op 4550  df-uni 4815  df-br 5043  df-opab 5105  df-mpt 5123  df-id 5436  df-xp 5537  df-rel 5538  df-cnv 5539  df-co 5540  df-dm 5541  df-iota 6290  df-fun 6333  df-fv 6339  df-ov 7136  df-rlreg 20032 This theorem is referenced by:  rrgeq0  20039  znrrg  20688  deg1mul2  24694
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