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| Mirrors > Home > MPE Home > Th. List > mptrcl | Structured version Visualization version GIF version | ||
| Description: Reverse closure for a mapping: If the function value of a mapping has a member, the argument belongs to the base class of the mapping. (Contributed by AV, 4-Apr-2020.) |
| Ref | Expression |
|---|---|
| mptrcl.1 | ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) |
| Ref | Expression |
|---|---|
| mptrcl | ⊢ (𝐼 ∈ (𝐹‘𝑋) → 𝑋 ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | n0i 4286 | . 2 ⊢ (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅) | |
| 2 | mptrcl.1 | . . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 2 | dmmptss 6235 | . . . 4 ⊢ dom 𝐹 ⊆ 𝐴 |
| 4 | 3 | sseli 3927 | . . 3 ⊢ (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴) |
| 5 | ndmfv 6909 | . . 3 ⊢ (¬ 𝑋 ∈ dom 𝐹 → (𝐹‘𝑋) = ∅) | |
| 6 | 4, 5 | nsyl4 159 | . 2 ⊢ (¬ (𝐹‘𝑋) = ∅ → 𝑋 ∈ 𝐴) |
| 7 | 1, 6 | syl 18 | 1 ⊢ (𝐼 ∈ (𝐹‘𝑋) → 𝑋 ∈ 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1570 ∈ wcel 2145 ∅c0 4279 ↦ cmpt 5186 dom cdm 5651 ‘cfv 6531 |
| 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 |
| 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-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-xp 5657 df-rel 5658 df-cnv 5659 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6487 df-fv 6539 |
| This theorem is used by: bitsval 16574 subcrcl 17971 initorcl 18145 termorcl 18146 zeroorcl 18147 submrcl 18977 issubg 19316 isnsg 19345 issubrng 20779 issubrg 20803 issdrg 21025 abvrcl 21050 isobs 22006 mhprcl 22444 islocfin 23816 kgeni 23836 elmptrab 24126 isphtpc 25295 cfili 25569 cfilfcls 25575 plybss 26492 eleenn 29456 neircl 49957 sectrcl 50074 invrcl 50076 isorcl 50085 sectpropdlem 50088 invpropdlem 50090 isopropdlem 50092 lmdrcl 50703 cmdrcl 50704 lmdfval2 50707 cmdfval2 50708 |
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