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| Mirrors > Home > MPE Home > Th. List > fczsupp0 | Structured version Visualization version GIF version | ||
| Description: The support of a constant function with value zero is empty. (Contributed by AV, 30-Jun-2019.) |
| Ref | Expression |
|---|---|
| fczsupp0 | ⊢ ((𝐵 × {𝑍}) supp 𝑍) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqidd 2738 | . . 3 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → (𝐵 × {𝑍}) = (𝐵 × {𝑍})) | |
| 2 | fnconstg 6723 | . . . . 5 ⊢ (𝑍 ∈ V → (𝐵 × {𝑍}) Fn 𝐵) | |
| 3 | 2 | adantl 481 | . . . 4 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → (𝐵 × {𝑍}) Fn 𝐵) |
| 4 | snnzg 4719 | . . . . 5 ⊢ (𝑍 ∈ V → {𝑍} ≠ ∅) | |
| 5 | simpl 482 | . . . . 5 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → (𝐵 × {𝑍}) ∈ V) | |
| 6 | xpexcnv 7865 | . . . . 5 ⊢ (({𝑍} ≠ ∅ ∧ (𝐵 × {𝑍}) ∈ V) → 𝐵 ∈ V) | |
| 7 | 4, 5, 6 | syl2an2 687 | . . . 4 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → 𝐵 ∈ V) |
| 8 | simpr 484 | . . . 4 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → 𝑍 ∈ V) | |
| 9 | fnsuppeq0 8136 | . . . 4 ⊢ (((𝐵 × {𝑍}) Fn 𝐵 ∧ 𝐵 ∈ V ∧ 𝑍 ∈ V) → (((𝐵 × {𝑍}) supp 𝑍) = ∅ ↔ (𝐵 × {𝑍}) = (𝐵 × {𝑍}))) | |
| 10 | 3, 7, 8, 9 | syl3anc 1374 | . . 3 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → (((𝐵 × {𝑍}) supp 𝑍) = ∅ ↔ (𝐵 × {𝑍}) = (𝐵 × {𝑍}))) |
| 11 | 1, 10 | mpbird 257 | . 2 ⊢ (((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → ((𝐵 × {𝑍}) supp 𝑍) = ∅) |
| 12 | supp0prc 8107 | . 2 ⊢ (¬ ((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → ((𝐵 × {𝑍}) supp 𝑍) = ∅) | |
| 13 | 11, 12 | pm2.61i 182 | 1 ⊢ ((𝐵 × {𝑍}) supp 𝑍) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 Vcvv 3430 ∅c0 4274 {csn 4568 × cxp 5623 Fn wfn 6488 (class class class)co 7361 supp csupp 8104 |
| 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 5213 ax-sep 5232 ax-nul 5242 ax-pr 5371 ax-un 7683 |
| 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 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-ov 7364 df-oprab 7365 df-mpo 7366 df-supp 8105 |
| This theorem is referenced by: fczfsuppd 9293 cantnf 9608 mhp0cl 22125 elrgspnlem4 33324 extvfvcl 33698 cantnfresb 43773 |
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