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Mirrors > Home > MPE Home > Th. List > Mathboxes > isldsys | Structured version Visualization version Unicode version |
Description: The property of being a lambda-system or Dynkin system. Lambda-systems contain the empty set, are closed under complement, and closed under countable disjoint union. (Contributed by Thierry Arnoux, 13-Jun-2020.) |
Ref | Expression |
---|---|
isldsys.l | Disj |
Ref | Expression |
---|---|
isldsys | Disj |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq2 2690 | . . 3 | |
2 | eleq2 2690 | . . . 4 | |
3 | 2 | raleqbi1dv 3146 | . . 3 |
4 | pweq 4161 | . . . 4 | |
5 | eleq2 2690 | . . . . 5 | |
6 | 5 | imbi2d 330 | . . . 4 Disj Disj |
7 | 4, 6 | raleqbidv 3152 | . . 3 Disj Disj |
8 | 1, 3, 7 | 3anbi123d 1399 | . 2 Disj Disj |
9 | isldsys.l | . 2 Disj | |
10 | 8, 9 | elrab2 3366 | 1 Disj |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 w3a 1037 wceq 1483 wcel 1990 wral 2912 crab 2916 cdif 3571 c0 3915 cpw 4158 cuni 4436 Disj wdisj 4620 class class class wbr 4653 com 7065 cdom 7953 |
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-3an 1039 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-in 3581 df-ss 3588 df-pw 4160 |
This theorem is referenced by: pwldsys 30220 unelldsys 30221 sigaldsys 30222 ldsysgenld 30223 sigapildsyslem 30224 sigapildsys 30225 ldgenpisyslem1 30226 |
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