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| Mirrors > Home > MPE Home > Th. List > inlresf1 | Structured version Visualization version GIF version | ||
| Description: The left injection restricted to the left class of a disjoint union is an injective function from the left class into the disjoint union. (Contributed by AV, 28-Jun-2022.) |
| Ref | Expression |
|---|---|
| inlresf1 | ⊢ (inl ↾ 𝐴):𝐴–1-1→(𝐴 ⊔ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | djulf1o 9993 | . . 3 ⊢ inl:V–1-1-onto→({∅} × V) | |
| 2 | f1of1 6823 | . . 3 ⊢ (inl:V–1-1-onto→({∅} × V) → inl:V–1-1→({∅} × V)) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ inl:V–1-1→({∅} × V) |
| 4 | ssv 3955 | . 2 ⊢ 𝐴 ⊆ V | |
| 5 | inlresf 9995 | . 2 ⊢ (inl ↾ 𝐴):𝐴⟶(𝐴 ⊔ 𝐵) | |
| 6 | f1resf1 6788 | . 2 ⊢ ((inl:V–1-1→({∅} × V) ∧ 𝐴 ⊆ V ∧ (inl ↾ 𝐴):𝐴⟶(𝐴 ⊔ 𝐵)) → (inl ↾ 𝐴):𝐴–1-1→(𝐴 ⊔ 𝐵)) | |
| 7 | 3, 4, 5, 6 | mp3an 1490 | 1 ⊢ (inl ↾ 𝐴):𝐴–1-1→(𝐴 ⊔ 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: Vcvv 3451 ⊆ wss 3899 ∅c0 4279 {csn 4584 × cxp 5649 ↾ cres 5653 ⟶wf 6534 –1-1→wf1 6535 –1-1-onto→wf1o 6537 ⊔ cdju 9979 inlcinl 9980 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-1st 8001 df-2nd 8002 df-dju 9982 df-inl 9983 |
| This theorem is used by: (None) |
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