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Mirrors > Home > MPE Home > Th. List > dfif4 | Structured version Visualization version Unicode version |
Description: Alternate definition of the conditional operator df-if 4087. Note that is independent of i.e. a constant true or false. (Contributed by NM, 25-Aug-2013.) |
Ref | Expression |
---|---|
dfif3.1 |
Ref | Expression |
---|---|
dfif4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfif3.1 | . . 3 | |
2 | 1 | dfif3 4100 | . 2 |
3 | undir 3876 | . 2 | |
4 | undi 3874 | . . . 4 | |
5 | undi 3874 | . . . . 5 | |
6 | uncom 3757 | . . . . . 6 | |
7 | unvdif 4042 | . . . . . 6 | |
8 | 6, 7 | ineq12i 3812 | . . . . 5 |
9 | inv1 3970 | . . . . 5 | |
10 | 5, 8, 9 | 3eqtri 2648 | . . . 4 |
11 | 4, 10 | ineq12i 3812 | . . 3 |
12 | inass 3823 | . . 3 | |
13 | 11, 12 | eqtri 2644 | . 2 |
14 | 2, 3, 13 | 3eqtri 2648 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wceq 1483 cab 2608 cvv 3200 cdif 3571 cun 3572 cin 3573 cif 4086 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 |
This theorem is referenced by: dfif5 4102 |
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