Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > issros | Structured version Visualization version Unicode version |
Description: The property of being a semi-rings of sets, i.e. collections of sets containing the empty set, closed under finite intersection, and where complements can be written as finite disjoint unions. (Contributed by Thierry Arnoux, 18-Jul-2020.) |
Ref | Expression |
---|---|
issros.1 | Disj |
Ref | Expression |
---|---|
issros | Disj |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq2 2690 | . . . 4 | |
2 | eleq2 2690 | . . . . . . 7 | |
3 | pweq 4161 | . . . . . . . 8 | |
4 | 3 | rexeqdv 3145 | . . . . . . 7 Disj Disj |
5 | 2, 4 | anbi12d 747 | . . . . . 6 Disj Disj |
6 | 5 | raleqbi1dv 3146 | . . . . 5 Disj Disj |
7 | 6 | raleqbi1dv 3146 | . . . 4 Disj Disj |
8 | 1, 7 | anbi12d 747 | . . 3 Disj Disj |
9 | issros.1 | . . 3 Disj | |
10 | 8, 9 | elrab2 3366 | . 2 Disj |
11 | 3anass 1042 | . 2 Disj Disj | |
12 | 10, 11 | bitr4i 267 | 1 Disj |
Colors of variables: wff setvar class |
Syntax hints: wb 196 wa 384 w3a 1037 wceq 1483 wcel 1990 wral 2912 wrex 2913 crab 2916 cdif 3571 cin 3573 c0 3915 cpw 4158 cuni 4436 Disj wdisj 4620 cfn 7955 |
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-rex 2918 df-rab 2921 df-v 3202 df-in 3581 df-ss 3588 df-pw 4160 |
This theorem is referenced by: srossspw 30239 0elsros 30240 inelsros 30241 diffiunisros 30242 rossros 30243 |
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