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Mathbox for Scott Fenton |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-symdif | Structured version Unicode version |
Description: Define the symmetric difference of two classes. (Contributed by Scott Fenton, 31-Mar-2012.) |
Ref | Expression |
---|---|
df-symdif |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cA |
. . 3
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2 | cB |
. . 3
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3 | 1, 2 | csymdif 27984 |
. 2
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4 | 1, 2 | cdif 3425 |
. . 3
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5 | 2, 1 | cdif 3425 |
. . 3
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6 | 4, 5 | cun 3426 |
. 2
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7 | 3, 6 | wceq 1370 |
1
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Colors of variables: wff setvar class |
This definition is referenced by: symdifcom 27986 symdifeq1 27987 nfsymdif 27989 elsymdif 27990 symdif0 27991 symdifV 27992 symdifid 27993 |
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