| Mathbox for Thierry Arnoux |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > indsupp | Structured version Visualization version GIF version | ||
| Description: The support of the indicator function. (Contributed by Thierry Arnoux, 13-Oct-2025.) |
| Ref | Expression |
|---|---|
| indsupp | ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → (((𝟭‘𝑂)‘𝐴) supp 0) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 482 | . . 3 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → 𝑂 ∈ 𝑉) | |
| 2 | c0ex 11129 | . . . 4 ⊢ 0 ∈ V | |
| 3 | 2 | a1i 11 | . . 3 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → 0 ∈ V) |
| 4 | indf 12156 | . . 3 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → ((𝟭‘𝑂)‘𝐴):𝑂⟶{0, 1}) | |
| 5 | fsuppeq 8118 | . . . 4 ⊢ ((𝑂 ∈ 𝑉 ∧ 0 ∈ V) → (((𝟭‘𝑂)‘𝐴):𝑂⟶{0, 1} → (((𝟭‘𝑂)‘𝐴) supp 0) = (◡((𝟭‘𝑂)‘𝐴) “ ({0, 1} ∖ {0})))) | |
| 6 | 5 | imp 406 | . . 3 ⊢ (((𝑂 ∈ 𝑉 ∧ 0 ∈ V) ∧ ((𝟭‘𝑂)‘𝐴):𝑂⟶{0, 1}) → (((𝟭‘𝑂)‘𝐴) supp 0) = (◡((𝟭‘𝑂)‘𝐴) “ ({0, 1} ∖ {0}))) |
| 7 | 1, 3, 4, 6 | syl21anc 838 | . 2 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → (((𝟭‘𝑂)‘𝐴) supp 0) = (◡((𝟭‘𝑂)‘𝐴) “ ({0, 1} ∖ {0}))) |
| 8 | prcom 4677 | . . . . . 6 ⊢ {0, 1} = {1, 0} | |
| 9 | 8 | difeq1i 4063 | . . . . 5 ⊢ ({0, 1} ∖ {0}) = ({1, 0} ∖ {0}) |
| 10 | ax-1ne0 11098 | . . . . . 6 ⊢ 1 ≠ 0 | |
| 11 | difprsn2 4745 | . . . . . 6 ⊢ (1 ≠ 0 → ({1, 0} ∖ {0}) = {1}) | |
| 12 | 10, 11 | ax-mp 5 | . . . . 5 ⊢ ({1, 0} ∖ {0}) = {1} |
| 13 | 9, 12 | eqtri 2760 | . . . 4 ⊢ ({0, 1} ∖ {0}) = {1} |
| 14 | 13 | a1i 11 | . . 3 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → ({0, 1} ∖ {0}) = {1}) |
| 15 | 14 | imaeq2d 6019 | . 2 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → (◡((𝟭‘𝑂)‘𝐴) “ ({0, 1} ∖ {0})) = (◡((𝟭‘𝑂)‘𝐴) “ {1})) |
| 16 | indpi1 12164 | . 2 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → (◡((𝟭‘𝑂)‘𝐴) “ {1}) = 𝐴) | |
| 17 | 7, 15, 16 | 3eqtrd 2776 | 1 ⊢ ((𝑂 ∈ 𝑉 ∧ 𝐴 ⊆ 𝑂) → (((𝟭‘𝑂)‘𝐴) supp 0) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 Vcvv 3430 ∖ cdif 3887 ⊆ wss 3890 {csn 4568 {cpr 4570 ◡ccnv 5623 “ cima 5627 ⟶wf 6488 ‘cfv 6492 (class class class)co 7360 supp csupp 8103 0cc0 11029 1c1 11030 𝟭cind 12150 |
| 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 5212 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-i2m1 11097 ax-1ne0 11098 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 |
| 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 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7363 df-oprab 7364 df-mpo 7365 df-supp 8104 df-ind 12151 |
| This theorem is referenced by: indfsd 32943 elrgspnsubrunlem1 33323 gsumind 33420 mplmulmvr 33698 esplymhp 33727 esplyfv1 33728 esplyfval1 33732 |
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