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Mirrors > Home > ILE Home > Th. List > dcor | Unicode version |
Description: A disjunction of two decidable propositions is decidable. (Contributed by Jim Kingdon, 21-Apr-2018.) |
Ref | Expression |
---|---|
dcor | DECID DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dc 743 | . 2 DECID | |
2 | orc 633 | . . . . . 6 | |
3 | 2 | orcd 652 | . . . . 5 |
4 | df-dc 743 | . . . . 5 DECID | |
5 | 3, 4 | sylibr 137 | . . . 4 DECID |
6 | 5 | a1d 22 | . . 3 DECID DECID |
7 | df-dc 743 | . . . . 5 DECID | |
8 | olc 632 | . . . . . . . . 9 | |
9 | 8 | adantl 262 | . . . . . . . 8 |
10 | 9 | orcd 652 | . . . . . . 7 |
11 | 10, 4 | sylibr 137 | . . . . . 6 DECID |
12 | ioran 669 | . . . . . . . . 9 | |
13 | 12 | biimpri 124 | . . . . . . . 8 |
14 | 13 | olcd 653 | . . . . . . 7 |
15 | 14, 4 | sylibr 137 | . . . . . 6 DECID |
16 | 11, 15 | jaodan 710 | . . . . 5 DECID |
17 | 7, 16 | sylan2b 271 | . . . 4 DECID DECID |
18 | 17 | ex 108 | . . 3 DECID DECID |
19 | 6, 18 | jaoi 636 | . 2 DECID DECID |
20 | 1, 19 | sylbi 114 | 1 DECID DECID DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 97 wo 629 DECID wdc 742 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 |
This theorem depends on definitions: df-bi 110 df-dc 743 |
This theorem is referenced by: pm4.55dc 846 pm3.12dc 865 pm3.13dc 866 dn1dc 867 eueq3dc 2715 distrlem4prl 6682 distrlem4pru 6683 |
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