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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 4303 | . 2 ⊢ (𝐼 ∈ (𝐹‘𝑋) → ¬ (𝐹‘𝑋) = ∅) | |
| 2 | mptrcl.1 | . . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 2 | dmmptss 6214 | . . . 4 ⊢ dom 𝐹 ⊆ 𝐴 |
| 4 | 3 | sseli 3942 | . . 3 ⊢ (𝑋 ∈ dom 𝐹 → 𝑋 ∈ 𝐴) |
| 5 | ndmfv 6893 | . . 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 1540 ∈ wcel 2109 ∅c0 4296 ↦ cmpt 5188 dom cdm 5638 ‘cfv 6511 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pr 5387 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ral 3045 df-rex 3054 df-rab 3406 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4297 df-if 4489 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-mpt 5189 df-xp 5644 df-rel 5645 df-cnv 5646 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-iota 6464 df-fv 6519 |
| This theorem is referenced by: bitsval 16394 subcrcl 17778 initorcl 17952 termorcl 17953 zeroorcl 17954 submrcl 18729 issubg 19058 isnsg 19087 issubrng 20456 issubrg 20480 issdrg 20697 abvrcl 20722 isobs 21629 mhprcl 22030 islocfin 23404 kgeni 23424 elmptrab 23714 isphtpc 24893 cfili 25168 cfilfcls 25174 plybss 26099 eleenn 28823 neircl 48893 sectrcl 49011 invrcl 49013 isorcl 49022 sectpropdlem 49025 invpropdlem 49027 isopropdlem 49029 lmdrcl 49640 cmdrcl 49641 lmdfval2 49644 cmdfval2 49645 |
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