Theorem wcom1 390

Description: Commutation with 1. Kalmbach 83 p. 20.

Assertion

Ref	Expression
wcom1	C (1, a) = 1

Proof of Theorem wcom1

Step	Hyp	Ref	Expression
1		comm1 171	. . . 4 1 C a
2	1	df-c2 125	. . 3 1 = ((1 ∩ a) ∪ (1 ∩ a⊥ ))
3	2	bi1 110	. 2 (1 ≡ ((1 ∩ a) ∪ (1 ∩ a⊥ ))) = 1
4	3	wdf-c1 365	1 C (1, a) = 1

Syntax hints:   = wb 1  ^⊥ wn 4   ∪ wo 6   ∩ wa 7  1wt 9   C wcmtr 28

This theorem was proved from axioms:  ax-a1 29  ax-a2 30  ax-a3 31  ax-a4 32  ax-a5 33  ax-r1 34  ax-r2 35  ax-r4 36  ax-r5 37  ax-wom 343

This theorem depends on definitions:  df-b 38  df-a 39  df-t 40  df-f 41  df-i1 43  df-i2 44  df-le 121  df-le1 122  df-le2 123  df-c1 124  df-c2 125  df-cmtr 126

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