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Mirrors > Home > ILE Home > Th. List > casef1 | Unicode version |
Description: The "case" construction of two injective functions with disjoint ranges is an injective function. (Contributed by BJ, 10-Jul-2022.) |
Ref | Expression |
---|---|
casef1.f | |
casef1.g | |
casef1.disj |
Ref | Expression |
---|---|
casef1 | case ⊔ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | casef1.f | . . . 4 | |
2 | f1f 5376 | . . . 4 | |
3 | 1, 2 | syl 14 | . . 3 |
4 | casef1.g | . . . 4 | |
5 | f1f 5376 | . . . 4 | |
6 | 4, 5 | syl 14 | . . 3 |
7 | 3, 6 | casef 7033 | . 2 case ⊔ |
8 | df-f1 5176 | . . . . 5 | |
9 | 8 | simprbi 273 | . . . 4 |
10 | 1, 9 | syl 14 | . . 3 |
11 | df-f1 5176 | . . . . 5 | |
12 | 11 | simprbi 273 | . . . 4 |
13 | 4, 12 | syl 14 | . . 3 |
14 | casef1.disj | . . 3 | |
15 | 10, 13, 14 | caseinj 7034 | . 2 case |
16 | df-f1 5176 | . 2 case ⊔ case ⊔ case | |
17 | 7, 15, 16 | sylanbrc 414 | 1 case ⊔ |
Colors of variables: wff set class |
Syntax hints: wi 4 wceq 1335 cin 3101 c0 3394 ccnv 4586 crn 4588 wfun 5165 wf 5167 wf1 5168 ⊔ cdju 6982 casecdjucase 7028 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-sep 4083 ax-nul 4091 ax-pow 4136 ax-pr 4170 ax-un 4394 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-ral 2440 df-rex 2441 df-v 2714 df-sbc 2938 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-nul 3395 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-uni 3774 df-br 3967 df-opab 4027 df-mpt 4028 df-tr 4064 df-id 4254 df-iord 4327 df-on 4329 df-suc 4332 df-xp 4593 df-rel 4594 df-cnv 4595 df-co 4596 df-dm 4597 df-rn 4598 df-res 4599 df-ima 4600 df-iota 5136 df-fun 5173 df-fn 5174 df-f 5175 df-f1 5176 df-fo 5177 df-f1o 5178 df-fv 5179 df-1st 6089 df-2nd 6090 df-1o 6364 df-dju 6983 df-inl 6992 df-inr 6993 df-case 7029 |
This theorem is referenced by: djudom 7038 exmidsbthrlem 13635 |
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