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Mirrors > Home > MPE Home > Th. List > Mathboxes > neiin | Structured version Visualization version Unicode version |
Description: Two neighborhoods intersect to form a neighborhood of the intersection. (Contributed by Jeff Hankins, 31-Aug-2009.) |
Ref | Expression |
---|---|
neiin |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 477 | . . . . . . 7 | |
2 | simpl 473 | . . . . . . . 8 | |
3 | eqid 2622 | . . . . . . . . 9 | |
4 | 3 | neiss2 20905 | . . . . . . . 8 |
5 | 3 | neii1 20910 | . . . . . . . 8 |
6 | 3 | neiint 20908 | . . . . . . . 8 |
7 | 2, 4, 5, 6 | syl3anc 1326 | . . . . . . 7 |
8 | 1, 7 | mpbid 222 | . . . . . 6 |
9 | ssinss1 3841 | . . . . . 6 | |
10 | 8, 9 | syl 17 | . . . . 5 |
11 | 10 | 3adant3 1081 | . . . 4 |
12 | inss2 3834 | . . . . 5 | |
13 | simpr 477 | . . . . . . 7 | |
14 | simpl 473 | . . . . . . . 8 | |
15 | 3 | neiss2 20905 | . . . . . . . 8 |
16 | 3 | neii1 20910 | . . . . . . . 8 |
17 | 3 | neiint 20908 | . . . . . . . 8 |
18 | 14, 15, 16, 17 | syl3anc 1326 | . . . . . . 7 |
19 | 13, 18 | mpbid 222 | . . . . . 6 |
20 | 19 | 3adant2 1080 | . . . . 5 |
21 | 12, 20 | syl5ss 3614 | . . . 4 |
22 | 11, 21 | ssind 3837 | . . 3 |
23 | simp1 1061 | . . . 4 | |
24 | 5 | 3adant3 1081 | . . . 4 |
25 | 16 | 3adant2 1080 | . . . 4 |
26 | 3 | ntrin 20865 | . . . 4 |
27 | 23, 24, 25, 26 | syl3anc 1326 | . . 3 |
28 | 22, 27 | sseqtr4d 3642 | . 2 |
29 | ssinss1 3841 | . . . . 5 | |
30 | 4, 29 | syl 17 | . . . 4 |
31 | ssinss1 3841 | . . . . 5 | |
32 | 5, 31 | syl 17 | . . . 4 |
33 | 3 | neiint 20908 | . . . 4 |
34 | 2, 30, 32, 33 | syl3anc 1326 | . . 3 |
35 | 34 | 3adant3 1081 | . 2 |
36 | 28, 35 | mpbird 247 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 w3a 1037 wceq 1483 wcel 1990 cin 3573 wss 3574 cuni 4436 cfv 5888 ctop 20698 cnt 20821 cnei 20901 |
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-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
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-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-iin 4523 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-top 20699 df-cld 20823 df-ntr 20824 df-cls 20825 df-nei 20902 |
This theorem is referenced by: (None) |
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