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Theorem 2arwcatlem5 50528
Description: Lemma for 2arwcat 50529. (Contributed by Zhi Wang, 5-Nov-2025.)
Hypotheses
Ref Expression
2arwcatlem5.1 (𝜑 → ( 1 · 0 ) = 0 )
2arwcatlem5.2 (𝜑 → ( 0 · 1 ) = 0 )
2arwcatlem5.3 (𝜑 → ( 0 · 0 ) ∈ { 0 , 1 })
Assertion
Ref Expression
2arwcatlem5 (𝜑 → (( 0 · 0 ) · 0 ) = ( 0 · ( 0 · 0 )))

Proof of Theorem 2arwcatlem5
StepHypRef Expression
1 simpr 490 . . . 4 ((𝜑 ∧ ( 0 · 0 ) = 0 ) → ( 0 · 0 ) = 0 )
21oveq1d 7429 . . 3 ((𝜑 ∧ ( 0 · 0 ) = 0 ) → (( 0 · 0 ) · 0 ) = ( 0 · 0 ))
31oveq2d 7430 . . 3 ((𝜑 ∧ ( 0 · 0 ) = 0 ) → ( 0 · ( 0 · 0 )) = ( 0 · 0 ))
42, 3eqtr4d 2798 . 2 ((𝜑 ∧ ( 0 · 0 ) = 0 ) → (( 0 · 0 ) · 0 ) = ( 0 · ( 0 · 0 )))
5 2arwcatlem5.1 . . . . 5 (𝜑 → ( 1 · 0 ) = 0 )
6 2arwcatlem5.2 . . . . 5 (𝜑 → ( 0 · 1 ) = 0 )
75, 6eqtr4d 2798 . . . 4 (𝜑 → ( 1 · 0 ) = ( 0 · 1 ))
87adantr 486 . . 3 ((𝜑 ∧ ( 0 · 0 ) = 1 ) → ( 1 · 0 ) = ( 0 · 1 ))
9 simpr 490 . . . 4 ((𝜑 ∧ ( 0 · 0 ) = 1 ) → ( 0 · 0 ) = 1 )
109oveq1d 7429 . . 3 ((𝜑 ∧ ( 0 · 0 ) = 1 ) → (( 0 · 0 ) · 0 ) = ( 1 · 0 ))
119oveq2d 7430 . . 3 ((𝜑 ∧ ( 0 · 0 ) = 1 ) → ( 0 · ( 0 · 0 )) = ( 0 · 1 ))
128, 10, 113eqtr4d 2805 . 2 ((𝜑 ∧ ( 0 · 0 ) = 1 ) → (( 0 · 0 ) · 0 ) = ( 0 · ( 0 · 0 )))
13 2arwcatlem5.3 . . 3 (𝜑 → ( 0 · 0 ) ∈ { 0 , 1 })
14 ovex 7447 . . . 4 ( 0 · 0 ) ∈ V
1514elpr 4609 . . 3 (( 0 · 0 ) ∈ { 0 , 1 } ↔ (( 0 · 0 ) = 0 ∨ ( 0 · 0 ) = 1 ))
1613, 15sylib 221 . 2 (𝜑 → (( 0 · 0 ) = 0 ∨ ( 0 · 0 ) = 1 ))
174, 12, 16mpjaodan 973 1 (𝜑 → (( 0 · 0 ) · 0 ) = ( 0 · ( 0 · 0 )))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401  wo 861   = wceq 1570  wcel 2145  {cpr 4586  (class class class)co 7414
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-nul 5263
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6489  df-fv 6541  df-ov 7417
This theorem is used by:  2arwcat  50529
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