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Mirrors > Home > ILE Home > Th. List > 19.36-1 | Unicode version |
Description: Closed form of 19.36i 1602. One direction of Theorem 19.36 of [Margaris] p. 90. The converse holds in classical logic, but does not hold (for all propositions) in intuitionistic logic. (Contributed by Jim Kingdon, 20-Jun-2018.) |
Ref | Expression |
---|---|
19.36-1.1 |
Ref | Expression |
---|---|
19.36-1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.35-1 1555 | . 2 | |
2 | 19.36-1.1 | . . 3 | |
3 | 2 | 19.9 1575 | . 2 |
4 | 1, 3 | syl6ib 159 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wal 1282 wnf 1389 wex 1421 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-4 1440 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 df-nf 1390 |
This theorem is referenced by: vtocl2 2654 vtocl3 2655 spcimgft 2674 |
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