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Mirrors > Home > MPE Home > Th. List > resasplit | Structured version Visualization version Unicode version |
Description: If two functions agree on their common domain, express their union as a union of three functions with pairwise disjoint domains. (Contributed by Stefan O'Rear, 9-Oct-2014.) |
Ref | Expression |
---|---|
resasplit |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fnresdm 6000 | . . . 4 | |
2 | fnresdm 6000 | . . . 4 | |
3 | uneq12 3762 | . . . 4 | |
4 | 1, 2, 3 | syl2an 494 | . . 3 |
5 | 4 | 3adant3 1081 | . 2 |
6 | simp3 1063 | . . . . . . 7 | |
7 | 6 | uneq1d 3766 | . . . . . 6 |
8 | 7 | uneq2d 3767 | . . . . 5 |
9 | inundif 4046 | . . . . . . . 8 | |
10 | 9 | reseq2i 5393 | . . . . . . 7 |
11 | resundi 5410 | . . . . . . 7 | |
12 | 10, 11 | eqtr3i 2646 | . . . . . 6 |
13 | incom 3805 | . . . . . . . . . 10 | |
14 | 13 | uneq1i 3763 | . . . . . . . . 9 |
15 | inundif 4046 | . . . . . . . . 9 | |
16 | 14, 15 | eqtri 2644 | . . . . . . . 8 |
17 | 16 | reseq2i 5393 | . . . . . . 7 |
18 | resundi 5410 | . . . . . . 7 | |
19 | 17, 18 | eqtr3i 2646 | . . . . . 6 |
20 | 12, 19 | uneq12i 3765 | . . . . 5 |
21 | 8, 20 | syl6reqr 2675 | . . . 4 |
22 | un4 3773 | . . . 4 | |
23 | 21, 22 | syl6eq 2672 | . . 3 |
24 | unidm 3756 | . . . 4 | |
25 | 24 | uneq1i 3763 | . . 3 |
26 | 23, 25 | syl6eq 2672 | . 2 |
27 | 5, 26 | eqtr3d 2658 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 w3a 1037 wceq 1483 cdif 3571 cun 3572 cin 3573 cres 5116 wfn 5883 |
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 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
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-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-rel 5121 df-dm 5124 df-res 5126 df-fun 5890 df-fn 5891 |
This theorem is referenced by: fresaun 6075 fresaunres2 6076 |
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