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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 4281 | . 2 ⊢ (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅) | |
| 2 | mptrcl.1 | . . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 2 | dmmptss 6199 | . . . 4 ⊢ dom 𝐹 ⊆ 𝐴 |
| 4 | 3 | sseli 3918 | . . 3 ⊢ (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴) |
| 5 | ndmfv 6866 | . . 3 ⊢ (¬ 𝑋 ∈ dom 𝐹 → (𝐹‘𝑋) = ∅) | |
| 6 | 4, 5 | nsyl4 158 | . 2 ⊢ (¬ (𝐹‘𝑋) = ∅ → 𝑋 ∈ 𝐴) |
| 7 | 1, 6 | syl 17 | 1 ⊢ (𝐼 ∈ (𝐹‘𝑋) → 𝑋 ∈ 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1542 ∈ wcel 2114 ∅c0 4274 ↦ cmpt 5167 dom cdm 5624 ‘cfv 6492 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pr 5370 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-xp 5630 df-rel 5631 df-cnv 5632 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fv 6500 |
| This theorem is referenced by: bitsval 16384 subcrcl 17774 initorcl 17948 termorcl 17949 zeroorcl 17950 submrcl 18761 issubg 19093 isnsg 19121 issubrng 20515 issubrg 20539 issdrg 20756 abvrcl 20781 isobs 21710 mhprcl 22119 islocfin 23492 kgeni 23512 elmptrab 23802 isphtpc 24971 cfili 25245 cfilfcls 25251 plybss 26169 eleenn 28979 neircl 49392 sectrcl 49509 invrcl 49511 isorcl 49520 sectpropdlem 49523 invpropdlem 49525 isopropdlem 49527 lmdrcl 50138 cmdrcl 50139 lmdfval2 50142 cmdfval2 50143 |
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