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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 4285 | . 2 ⊢ (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅) | |
| 2 | mptrcl.1 | . . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 2 | dmmptss 6242 | . . . 4 ⊢ dom 𝐹 ⊆ 𝐴 |
| 4 | 3 | sseli 3904 | . . 3 ⊢ (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴) |
| 5 | ndmfv 6917 | . . 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 1569 ∈ wcel 2144 ∅c0 4278 ↦ cmpt 5185 dom cdm 5650 ‘cfv 6538 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-xp 5656 df-rel 5657 df-cnv 5658 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6494 df-fv 6546 |
| This theorem is used by: bitsval 16599 subcrcl 17996 initorcl 18170 termorcl 18171 zeroorcl 18172 submrcl 19002 issubg 19341 isnsg 19370 issubrng 20804 issubrg 20828 issdrg 21050 abvrcl 21075 isobs 22031 mhprcl 22469 islocfin 23841 kgeni 23861 elmptrab 24151 isphtpc 25320 cfili 25594 cfilfcls 25600 plybss 26517 eleenn 29479 neircl 50112 sectrcl 50229 invrcl 50231 isorcl 50240 sectpropdlem 50243 invpropdlem 50245 isopropdlem 50247 lmdrcl 50927 cmdrcl 50928 lmdfval2 50931 cmdfval2 50932 |
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