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Mirrors > Home > ILE Home > Th. List > ifsbdc | Unicode version |
Description: Distribute a function over an if-clause. (Contributed by Jim Kingdon, 1-Jan-2022.) |
Ref | Expression |
---|---|
ifsbdc.1 | |
ifsbdc.2 |
Ref | Expression |
---|---|
ifsbdc | DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exmiddc 777 | . 2 DECID | |
2 | iftrue 3356 | . . . . 5 | |
3 | ifsbdc.1 | . . . . 5 | |
4 | 2, 3 | syl 14 | . . . 4 |
5 | iftrue 3356 | . . . 4 | |
6 | 4, 5 | eqtr4d 2116 | . . 3 |
7 | iffalse 3359 | . . . . 5 | |
8 | ifsbdc.2 | . . . . 5 | |
9 | 7, 8 | syl 14 | . . . 4 |
10 | iffalse 3359 | . . . 4 | |
11 | 9, 10 | eqtr4d 2116 | . . 3 |
12 | 6, 11 | jaoi 668 | . 2 |
13 | 1, 12 | syl 14 | 1 DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wo 661 DECID wdc 775 wceq 1284 cif 3351 |
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-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-11 1437 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-if 3352 |
This theorem is referenced by: fvifdc 5217 |
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