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Definition df-pw1 4137
Description: Define unit power class. Definition from [Rosser] p. 252. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
df-pw1 1A = (A ∩ 1c)

Detailed syntax breakdown of Definition df-pw1
StepHypRef Expression
1 cA . . 3 class A
21cpw1 4135 . 2 class 1A
31cpw 3722 . . 3 class A
4 c1c 4134 . . 3 class 1c
53, 4cin 3208 . 2 class (A ∩ 1c)
62, 5wceq 1642 1 wff 1A = (A ∩ 1c)
Colors of variables: wff setvar class
This definition is referenced by:  pw1eq  4143  elpw1  4144  pw1ss1c  4158  pw10  4161  pw1ss  4169  pw1sspw  4171
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