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Theorem resfsupp 9412
Description: If the restriction of a function by a set which, subtracted from the domain of the function so that its difference is finitely supported, the function itself is finitely supported. (Contributed by AV, 27-May-2019.)
Hypotheses
Ref Expression
resfsupp.b (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin)
resfsupp.e (𝜑 → 𝐹 ∈ 𝑊)
resfsupp.f (𝜑 → Fun 𝐹)
resfsupp.g (𝜑 → 𝐺 = (𝐹 ↾ 𝐵))
resfsupp.s (𝜑 → 𝐺 finSupp 𝑍)
resfsupp.z (𝜑 → 𝑍 ∈ 𝑉)
Assertion
Ref Expression
resfsupp (𝜑 → 𝐹 finSupp 𝑍)

Proof of Theorem resfsupp
StepHypRef Expression
1 resfsupp.b . . 3 (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin)
2 resfsupp.e . . 3 (𝜑 → 𝐹 ∈ 𝑊)
3 resfsupp.g . . 3 (𝜑 → 𝐺 = (𝐹 ↾ 𝐵))
4 resfsupp.s . . . 4 (𝜑 → 𝐺 finSupp 𝑍)
54fsuppimpd 9386 . . 3 (𝜑 → (𝐺 supp 𝑍) ∈ Fin)
6 resfsupp.z . . 3 (𝜑 → 𝑍 ∈ 𝑉)
71, 2, 3, 5, 6ressuppfi 9411 . 2 (𝜑 → (𝐹 supp 𝑍) ∈ Fin)
8 resfsupp.f . . 3 (𝜑 → Fun 𝐹)
9 funisfsupp 9384 . . 3 ((Fun 𝐹 ∧ 𝐹 ∈ 𝑊 ∧ 𝑍 ∈ 𝑉) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
108, 2, 6, 9syl3anc 1399 . 2 (𝜑 → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin))
117, 10mpbird 260 1 (𝜑 → 𝐹 finSupp 𝑍)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   = wceq 1570   ∈ wcel 2147   ∖ cdif 4048   class class class wbr 5106  dom cdm 5655   ↾ cres 5657  Fun wfun 6549  (class class class)co 7440   supp csupp 8201  Fincfn 8998   finSupp cfsupp 9378
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pr 5395  ax-un 7772
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-ord 6380  df-on 6381  df-lim 6382  df-suc 6383  df-iota 6509  df-fun 6557  df-fn 6558  df-f 6559  df-f1 6560  df-fo 6561  df-f1o 6562  df-fv 6563  df-ov 7443  df-oprab 7444  df-mpo 7445  df-om 7899  df-supp 8202  df-1o 8501  df-en 8999  df-fin 9002  df-fsupp 9379
This theorem is used by:  lincext2  49770
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