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Mirrors > Home > MPE Home > Th. List > iffalse | Structured version Visualization version Unicode version |
Description: Value of the conditional operator when its first argument is false. (Contributed by NM, 14-Aug-1999.) |
Ref | Expression |
---|---|
iffalse |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dedlemb 972 |
. . 3
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2 | 1 | abbi2dv 2581 |
. 2
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3 | df-if 3894 |
. 2
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4 | 2, 3 | syl6reqr 2515 |
1
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