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Mirrors > Home > ILE Home > Th. List > df-stab | Unicode version |
Description: Propositions where a
double-negative can be removed are called stable.
See Chapter 2 [Moschovakis] p. 2.
Our notation for stability is a connective STAB which we place before the formula in question. For example, STAB corresponds to "x = y is stable". (Contributed by David A. Wheeler, 13-Aug-2018.) |
Ref | Expression |
---|---|
df-stab | STAB |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 | |
2 | 1 | wstab 772 | . 2 STAB |
3 | 1 | wn 3 | . . . 4 |
4 | 3 | wn 3 | . . 3 |
5 | 4, 1 | wi 4 | . 2 |
6 | 2, 5 | wb 103 | 1 STAB |
Colors of variables: wff set class |
This definition is referenced by: stabnot 774 dcimpstab 785 stabtestimpdc 857 ddifstab 3104 bdstab 10618 |
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