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Mirrors > Home > ILE Home > Th. List > indi | Unicode version |
Description: Distributive law for intersection over union. Exercise 10 of [TakeutiZaring] p. 17. (Contributed by NM, 30-Sep-2002.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
Ref | Expression |
---|---|
indi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | andi 730 |
. . . 4
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2 | elin 3120 |
. . . . 5
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3 | elin 3120 |
. . . . 5
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4 | 2, 3 | orbi12i 680 |
. . . 4
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5 | 1, 4 | bitr4i 176 |
. . 3
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6 | elun 3078 |
. . . 4
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7 | 6 | anbi2i 430 |
. . 3
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8 | elun 3078 |
. . 3
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9 | 5, 7, 8 | 3bitr4i 201 |
. 2
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10 | 9 | ineqri 3124 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 629 ax-5 1333 ax-7 1334 ax-gen 1335 ax-ie1 1379 ax-ie2 1380 ax-8 1392 ax-10 1393 ax-11 1394 ax-i12 1395 ax-bndl 1396 ax-4 1397 ax-17 1416 ax-i9 1420 ax-ial 1424 ax-i5r 1425 ax-ext 2019 |
This theorem depends on definitions: df-bi 110 df-tru 1245 df-nf 1347 df-sb 1643 df-clab 2024 df-cleq 2030 df-clel 2033 df-nfc 2164 df-v 2553 df-un 2916 df-in 2918 |
This theorem is referenced by: indir 3180 undisj2 3274 disjssun 3279 difdifdirss 3301 disjpr2 3425 diftpsn3 3496 resundi 4568 |
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