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Mirrors > Home > MPE Home > Th. List > Mathboxes > fiinfi | Structured version Visualization version Unicode version |
Description: If two classes have the finite intersection property, then so does their intersection. (Contributed by Richard Penner, 1-Jan-2020.) |
Ref | Expression |
---|---|
fiinfi.a | |
fiinfi.b | |
fiinfi.c |
Ref | Expression |
---|---|
fiinfi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fiinfi.a | . . . . . . 7 | |
2 | elinel1 3799 | . . . . . . . . 9 | |
3 | elinel1 3799 | . . . . . . . . . . 11 | |
4 | 3 | imim1i 63 | . . . . . . . . . 10 |
5 | 4 | ralimi2 2949 | . . . . . . . . 9 |
6 | 2, 5 | imim12i 62 | . . . . . . . 8 |
7 | 6 | ralimi2 2949 | . . . . . . 7 |
8 | 1, 7 | syl 17 | . . . . . 6 |
9 | fiinfi.b | . . . . . . 7 | |
10 | elinel2 3800 | . . . . . . . . 9 | |
11 | elinel2 3800 | . . . . . . . . . . 11 | |
12 | 11 | imim1i 63 | . . . . . . . . . 10 |
13 | 12 | ralimi2 2949 | . . . . . . . . 9 |
14 | 10, 13 | imim12i 62 | . . . . . . . 8 |
15 | 14 | ralimi2 2949 | . . . . . . 7 |
16 | 9, 15 | syl 17 | . . . . . 6 |
17 | r19.26-2 3065 | . . . . . 6 | |
18 | 8, 16, 17 | sylanbrc 698 | . . . . 5 |
19 | elin 3796 | . . . . . 6 | |
20 | 19 | 2ralbii 2981 | . . . . 5 |
21 | 18, 20 | sylibr 224 | . . . 4 |
22 | fiinfi.c | . . . . . . 7 | |
23 | 22 | eleq2d 2687 | . . . . . 6 |
24 | 23 | ralbidv 2986 | . . . . 5 |
25 | 24 | ralbidv 2986 | . . . 4 |
26 | 21, 25 | mpbird 247 | . . 3 |
27 | 22 | raleqdv 3144 | . . . 4 |
28 | 27 | ralbidv 2986 | . . 3 |
29 | 26, 28 | mpbird 247 | . 2 |
30 | 22 | raleqdv 3144 | . 2 |
31 | 29, 30 | mpbird 247 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wa 384 wceq 1483 wcel 1990 wral 2912 cin 3573 |
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-v 3202 df-in 3581 |
This theorem is referenced by: (None) |
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