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Mathbox for Richard Penner |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > dfxor5 | Structured version Visualization version Unicode version |
Description: Express exclusive-or in terms of implication and negation. Statement in [Frege1879] p. 12. (Contributed by RP, 14-Apr-2020.) |
Ref | Expression |
---|---|
dfxor5 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfxor4 36352 |
. 2
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2 | con2b 336 |
. 2
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3 | 1, 2 | xchbinx 312 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 189 df-or 372 df-an 373 df-xor 1405 |
This theorem is referenced by: (None) |
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