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| Mirrors > Home > MPE Home > Th. List > fvn0elsuppb | Structured version Visualization version GIF version | ||
| Description: The function value for a given argument is not empty iff the argument belongs to the support of the function with the empty set as zero. (Contributed by AV, 4-Apr-2020.) |
| Ref | Expression |
|---|---|
| fvn0elsuppb | ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → ((𝐺‘𝑋) ≠ ∅ ↔ 𝑋 ∈ (𝐺 supp ∅))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fvn0elsupp 8134 | . . . 4 ⊢ (((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵) ∧ (𝐺 Fn 𝐵 ∧ (𝐺‘𝑋) ≠ ∅)) → 𝑋 ∈ (𝐺 supp ∅)) | |
| 2 | 1 | exp43 436 | . . 3 ⊢ (𝐵 ∈ 𝑉 → (𝑋 ∈ 𝐵 → (𝐺 Fn 𝐵 → ((𝐺‘𝑋) ≠ ∅ → 𝑋 ∈ (𝐺 supp ∅))))) |
| 3 | 2 | 3imp 1111 | . 2 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → ((𝐺‘𝑋) ≠ ∅ → 𝑋 ∈ (𝐺 supp ∅))) |
| 4 | simp3 1139 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → 𝐺 Fn 𝐵) | |
| 5 | simp1 1137 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → 𝐵 ∈ 𝑉) | |
| 6 | 0ex 5256 | . . . . 5 ⊢ ∅ ∈ V | |
| 7 | 6 | a1i 11 | . . . 4 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → ∅ ∈ V) |
| 8 | elsuppfn 8124 | . . . 4 ⊢ ((𝐺 Fn 𝐵 ∧ 𝐵 ∈ 𝑉 ∧ ∅ ∈ V) → (𝑋 ∈ (𝐺 supp ∅) ↔ (𝑋 ∈ 𝐵 ∧ (𝐺‘𝑋) ≠ ∅))) | |
| 9 | 4, 5, 7, 8 | syl3anc 1374 | . . 3 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → (𝑋 ∈ (𝐺 supp ∅) ↔ (𝑋 ∈ 𝐵 ∧ (𝐺‘𝑋) ≠ ∅))) |
| 10 | simpr 484 | . . 3 ⊢ ((𝑋 ∈ 𝐵 ∧ (𝐺‘𝑋) ≠ ∅) → (𝐺‘𝑋) ≠ ∅) | |
| 11 | 9, 10 | biimtrdi 253 | . 2 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → (𝑋 ∈ (𝐺 supp ∅) → (𝐺‘𝑋) ≠ ∅)) |
| 12 | 3, 11 | impbid 212 | 1 ⊢ ((𝐵 ∈ 𝑉 ∧ 𝑋 ∈ 𝐵 ∧ 𝐺 Fn 𝐵) → ((𝐺‘𝑋) ≠ ∅ ↔ 𝑋 ∈ (𝐺 supp ∅))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 ∈ wcel 2114 ≠ wne 2933 Vcvv 3442 ∅c0 4287 Fn wfn 6497 ‘cfv 6502 (class class class)co 7370 supp csupp 8114 |
| 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-rep 5226 ax-sep 5245 ax-nul 5255 ax-pr 5381 ax-un 7692 |
| 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-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5529 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-ov 7373 df-oprab 7374 df-mpo 7375 df-supp 8115 |
| This theorem is referenced by: brcic 17736 |
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