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Theorem fsuppssindlem1 43451
Description: Lemma for fsuppssind 43453. 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 6948 . 2 (𝜑𝐹 = (𝑥𝐼 ↦ (𝐹𝑥)))
3 fvres 6899 . . . . 5 (𝑥𝑆 → ((𝐹𝑆)‘𝑥) = (𝐹𝑥))
43adantl 487 . . . 4 (((𝜑𝑥𝐼) ∧ 𝑥𝑆) → ((𝐹𝑆)‘𝑥) = (𝐹𝑥))
5 eldif 3909 . . . . . 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 8195 . . . . . . 7 ((𝜑𝑥 ∈ (𝐼𝑆)) → (𝐹𝑥) = 0 )
109eqcomd 2766 . . . . . 6 ((𝜑𝑥 ∈ (𝐼𝑆)) → 0 = (𝐹𝑥))
115, 10sylan2br 607 . . . . 5 ((𝜑 ∧ (𝑥𝐼 ∧ ¬ 𝑥𝑆)) → 0 = (𝐹𝑥))
1211anassrs 473 . . . 4 (((𝜑𝑥𝐼) ∧ ¬ 𝑥𝑆) → 0 = (𝐹𝑥))
134, 12ifeqda 4519 . . 3 ((𝜑𝑥𝐼) → if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 ) = (𝐹𝑥))
1413mpteq2dva 5198 . 2 (𝜑 → (𝑥𝐼 ↦ if(𝑥𝑆, ((𝐹𝑆)‘𝑥), 0 )) = (𝑥𝐼 ↦ (𝐹𝑥)))
152, 14eqtr4d 2798 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 401   = wceq 1570  wcel 2145  cdif 3896  wss 3899  ifcif 4482  cmpt 5186  cres 5657  wf 6530  cfv 6534  (class class class)co 7415   supp csupp 8160
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732  ax-rep 5232  ax-sep 5251  ax-nul 5263  ax-pr 5398  ax-un 7738
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5550  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-iota 6490  df-fun 6536  df-fn 6537  df-f 6538  df-f1 6539  df-fo 6540  df-f1o 6541  df-fv 6542  df-ov 7418  df-oprab 7419  df-mpo 7420  df-supp 8161
This theorem is used by:  fsuppssind  43453
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