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Theorem fsuppssindlem1 43351
Description: Lemma for fsuppssind 43353. Functions are zero outside of their support. (Contributed by SN, 15-Jul-2024.)
Hypotheses
Ref Expression
fsuppssindlem1.z (𝜑0𝑊)
fsuppssindlem1.v (𝜑𝐼𝑉)
fsuppssindlem1.1 (𝜑𝐹:𝐼𝐵)
fsuppssindlem1.2 (𝜑 → (𝐹 supp 0 ) ⊆ 𝑆)
Assertion
Ref Expression
fsuppssindlem1 (𝜑𝐹 = (𝑥𝐼 ↦ if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 )))
Distinct variable groups:   𝜑,𝑥   𝑥,𝐹   𝑥,𝐼
Allowed substitution hints:   𝐵(𝑥)   𝑆(𝑥)   𝑉(𝑥)   𝑊(𝑥)   0 (𝑥)

Proof of Theorem fsuppssindlem1
StepHypRef Expression
1 fsuppssindlem1.1 . . 3 (𝜑𝐹:𝐼𝐵)
21feqmptd 6949 . 2 (𝜑𝐹 = (𝑥𝐼 ↦ (𝐹𝑥)))
3 fvres 6900 . . . . 5 (𝑥𝑆 → ((𝐹𝑆)‘𝑥) = (𝐹𝑥))
43adantl 486 . . . 4 (((𝜑𝑥𝐼) ∧ 𝑥𝑆) → ((𝐹𝑆)‘𝑥) = (𝐹𝑥))
5 eldif 3915 . . . . . 6 (𝑥 ∈ (𝐼𝑆) ↔ (𝑥𝐼 ∧ ¬ 𝑥𝑆))
6 fsuppssindlem1.2 . . . . . . . 8 (𝜑 → (𝐹 supp 0 ) ⊆ 𝑆)
7 fsuppssindlem1.v . . . . . . . 8 (𝜑𝐼𝑉)
8 fsuppssindlem1.z . . . . . . . 8 (𝜑0𝑊)
91, 6, 7, 8suppssr 8187 . . . . . . 7 ((𝜑𝑥 ∈ (𝐼𝑆)) → (𝐹𝑥) = 0 )
109eqcomd 2769 . . . . . 6 ((𝜑𝑥 ∈ (𝐼𝑆)) → 0 = (𝐹𝑥))
115, 10sylan2br 606 . . . . 5 ((𝜑 ∧ (𝑥𝐼 ∧ ¬ 𝑥𝑆)) → 0 = (𝐹𝑥))
1211anassrs 472 . . . 4 (((𝜑𝑥𝐼) ∧ ¬ 𝑥𝑆) → 0 = (𝐹𝑥))
134, 12ifeqda 4524 . . 3 ((𝜑𝑥𝐼) → if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 ) = (𝐹𝑥))
1413mpteq2dva 5204 . 2 (𝜑 → (𝑥𝐼 ↦ if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 )) = (𝑥𝐼 ↦ (𝐹𝑥)))
152, 14eqtr4d 2801 1 (𝜑𝐹 = (𝑥𝐼 ↦ if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 )))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wi 4  wa 400   = wceq 1570  wcel 2143  cdif 3902  wss 3905  ifcif 4487  cmpt 5192  cres 5663  wf 6532  cfv 6536  (class class class)co 7410   supp csupp 8152
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-rep 5238  ax-sep 5257  ax-nul 5269  ax-pr 5404  ax-un 7732
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-reu 3370  df-rab 3417  df-v 3457  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-iun 4958  df-br 5110  df-opab 5174  df-mpt 5193  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-ov 7413  df-oprab 7414  df-mpo 7415  df-supp 8153
This theorem is used by:  fsuppssind  43353
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