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Mirrors > Home > ILE Home > Th. List > Mathboxes > df-alsi | Unicode version |
Description: Define "all some" applied to a top-level implication, which means is true whenever is true and there is at least one where is true. (Contributed by David A. Wheeler, 20-Oct-2018.) |
Ref | Expression |
---|---|
df-alsi | ! |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 | |
2 | wps | . . 3 | |
3 | vx | . . 3 | |
4 | 1, 2, 3 | walsi 10787 | . 2 ! |
5 | 1, 2 | wi 4 | . . . 4 |
6 | 5, 3 | wal 1282 | . . 3 |
7 | 1, 3 | wex 1421 | . . 3 |
8 | 6, 7 | wa 102 | . 2 |
9 | 4, 8 | wb 103 | 1 ! |
Colors of variables: wff set class |
This definition is referenced by: alsconv 10791 alsi1d 10792 alsi2d 10793 |
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