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Theorem fczsupp0 6472
Description: The support of a constant function with value zero is empty. (Contributed by AV, 30-Jun-2019.)
Assertion
Ref Expression
fczsupp0 ((𝐵 × {𝑍}) supp 𝑍) = ∅

Proof of Theorem fczsupp0
Dummy variables 𝑥 𝑓 𝑞 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-supp 6449 . . . . . 6 supp = (𝑓 ∈ V, 𝑧 ∈ V ↦ {𝑞 ∈ dom 𝑓 ∣ (𝑓 “ {𝑞}) ≠ {𝑧}})
21elmpocl 6257 . . . . 5 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → ((𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V))
32simprd 114 . . . 4 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → 𝑍 ∈ V)
4 fnconstg 5570 . . . . . . . 8 (𝑍 ∈ V → (𝐵 × {𝑍}) Fn 𝐵)
53, 4syl 14 . . . . . . 7 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → (𝐵 × {𝑍}) Fn 𝐵)
62simpld 112 . . . . . . 7 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → (𝐵 × {𝑍}) ∈ V)
7 elsuppfng 6455 . . . . . . 7 (((𝐵 × {𝑍}) Fn 𝐵 ∧ (𝐵 × {𝑍}) ∈ V ∧ 𝑍 ∈ V) → (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) ↔ (𝑥𝐵 ∧ ((𝐵 × {𝑍})‘𝑥) ≠ 𝑍)))
85, 6, 3, 7syl3anc 1274 . . . . . 6 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) ↔ (𝑥𝐵 ∧ ((𝐵 × {𝑍})‘𝑥) ≠ 𝑍)))
98ibi 176 . . . . 5 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → (𝑥𝐵 ∧ ((𝐵 × {𝑍})‘𝑥) ≠ 𝑍))
109simpld 112 . . . 4 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → 𝑥𝐵)
11 fvconst2g 5903 . . . 4 ((𝑍 ∈ V ∧ 𝑥𝐵) → ((𝐵 × {𝑍})‘𝑥) = 𝑍)
123, 10, 11syl2anc 411 . . 3 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → ((𝐵 × {𝑍})‘𝑥) = 𝑍)
139simprd 114 . . . 4 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → ((𝐵 × {𝑍})‘𝑥) ≠ 𝑍)
1413neneqd 2435 . . 3 (𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍) → ¬ ((𝐵 × {𝑍})‘𝑥) = 𝑍)
1512, 14pm2.65i 644 . 2 ¬ 𝑥 ∈ ((𝐵 × {𝑍}) supp 𝑍)
1615nel0 3534 1 ((𝐵 × {𝑍}) supp 𝑍) = ∅
Colors of variables: wff set class
Syntax hints:  wa 104  wb 105   = wceq 1398  wcel 2205  wne 2414  {crab 2526  Vcvv 2815  c0 3512  {csn 3694   × cxp 4752  dom cdm 4754  cima 4757   Fn wfn 5352  cfv 5357  (class class class)co 6058   supp csupp 6448
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3046  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-fv 5365  df-ov 6061  df-oprab 6062  df-mpo 6063  df-supp 6449
This theorem is referenced by:  fczfsuppd  7263
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