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Mirrors > Home > MPE Home > Th. List > dfif5 | 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 (see also ab0orv 3953). (Contributed by Gérard Lang, 18-Aug-2013.) |
Ref | Expression |
---|---|
dfif3.1 |
Ref | Expression |
---|---|
dfif5 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | inindi 3830 | . 2 | |
2 | dfif3.1 | . . 3 | |
3 | 2 | dfif4 4101 | . 2 |
4 | undir 3876 | . . 3 | |
5 | unidm 3756 | . . . . . . . 8 | |
6 | 5 | uneq1i 3763 | . . . . . . 7 |
7 | unass 3770 | . . . . . . 7 | |
8 | undi 3874 | . . . . . . 7 | |
9 | 6, 7, 8 | 3eqtr3ri 2653 | . . . . . 6 |
10 | undi 3874 | . . . . . . . 8 | |
11 | undifabs 4045 | . . . . . . . . 9 | |
12 | 11 | ineq1i 3810 | . . . . . . . 8 |
13 | inabs 3855 | . . . . . . . 8 | |
14 | 10, 12, 13 | 3eqtri 2648 | . . . . . . 7 |
15 | undif2 4044 | . . . . . . . . 9 | |
16 | 15 | ineq1i 3810 | . . . . . . . 8 |
17 | undi 3874 | . . . . . . . 8 | |
18 | 16, 17, 8 | 3eqtr4i 2654 | . . . . . . 7 |
19 | 14, 18 | uneq12i 3765 | . . . . . 6 |
20 | 9, 19 | eqtr4i 2647 | . . . . 5 |
21 | unundi 3774 | . . . . 5 | |
22 | 20, 21 | eqtr4i 2647 | . . . 4 |
23 | unass 3770 | . . . . . 6 | |
24 | undi 3874 | . . . . . . . . 9 | |
25 | uncom 3757 | . . . . . . . . 9 | |
26 | undif2 4044 | . . . . . . . . . 10 | |
27 | 26 | ineq1i 3810 | . . . . . . . . 9 |
28 | 24, 25, 27 | 3eqtr4i 2654 | . . . . . . . 8 |
29 | undi 3874 | . . . . . . . 8 | |
30 | 28, 29 | eqtr4i 2647 | . . . . . . 7 |
31 | undi 3874 | . . . . . . . 8 | |
32 | undifabs 4045 | . . . . . . . . 9 | |
33 | 32 | ineq1i 3810 | . . . . . . . 8 |
34 | inabs 3855 | . . . . . . . 8 | |
35 | 31, 33, 34 | 3eqtrri 2649 | . . . . . . 7 |
36 | 30, 35 | uneq12i 3765 | . . . . . 6 |
37 | unidm 3756 | . . . . . . 7 | |
38 | 37 | uneq2i 3764 | . . . . . 6 |
39 | 23, 36, 38 | 3eqtr3ri 2653 | . . . . 5 |
40 | uncom 3757 | . . . . . . 7 | |
41 | 40 | ineq2i 3811 | . . . . . 6 |
42 | undir 3876 | . . . . . 6 | |
43 | 41, 42 | eqtr4i 2647 | . . . . 5 |
44 | unundi 3774 | . . . . 5 | |
45 | 39, 43, 44 | 3eqtr4i 2654 | . . . 4 |
46 | 22, 45 | ineq12i 3812 | . . 3 |
47 | 4, 46 | eqtr4i 2647 | . 2 |
48 | 1, 3, 47 | 3eqtr4i 2654 | 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: (None) |
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