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Mirrors > Home > MPE Home > Th. List > trint | Structured version Visualization version Unicode version |
Description: The intersection of a class of transitive sets is transitive. Exercise 5(b) of [Enderton] p. 73. (Contributed by Scott Fenton, 25-Feb-2011.) |
Ref | Expression |
---|---|
trint |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dftr3 4756 | . . . . 5 | |
2 | 1 | ralbii 2980 | . . . 4 |
3 | df-ral 2917 | . . . . . 6 | |
4 | 3 | ralbii 2980 | . . . . 5 |
5 | ralcom4 3224 | . . . . 5 | |
6 | 4, 5 | bitri 264 | . . . 4 |
7 | 2, 6 | sylbb 209 | . . 3 |
8 | ralim 2948 | . . 3 | |
9 | 7, 8 | sylg 1750 | . 2 |
10 | dftr3 4756 | . . 3 | |
11 | df-ral 2917 | . . . 4 | |
12 | vex 3203 | . . . . . . 7 | |
13 | 12 | elint2 4482 | . . . . . 6 |
14 | ssint 4493 | . . . . . 6 | |
15 | 13, 14 | imbi12i 340 | . . . . 5 |
16 | 15 | albii 1747 | . . . 4 |
17 | 11, 16 | bitri 264 | . . 3 |
18 | 10, 17 | bitri 264 | . 2 |
19 | 9, 18 | sylibr 224 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wal 1481 wcel 1990 wral 2912 wss 3574 cint 4475 wtr 4752 |
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 df-ss 3588 df-uni 4437 df-int 4476 df-tr 4753 |
This theorem is referenced by: tctr 8616 intwun 9557 intgru 9636 dfon2lem8 31695 |
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