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Theorem hoidifhspf 47449
Description: 𝐷 is a function that returns the representation of the left side of the difference of a half-open interval and a half-space. Used in Lemma 115F of [Fremlin1] p. 31 . (Contributed by Glauco Siliprandi, 24-Dec-2020.)
Hypotheses
Ref Expression
hoidifhspf.d 𝐷 = (𝑥 ∈ ℝ ↦ (𝑎 ∈ (ℝ ↑m 𝑋) ↦ (𝑘𝑋 ↦ if(𝑘 = 𝐾, if(𝑥 ≤ (𝑎𝑘), (𝑎𝑘), 𝑥), (𝑎𝑘)))))
hoidifhspf.y (𝜑𝑌 ∈ ℝ)
hoidifhspf.x (𝜑𝑋𝑉)
hoidifhspf.a (𝜑𝐴:𝑋⟶ℝ)
Assertion
Ref Expression
hoidifhspf (𝜑 → ((𝐷𝑌)‘𝐴):𝑋⟶ℝ)
Distinct variable groups:   𝐴,𝑎,𝑘   𝐾,𝑎,𝑥   𝑋,𝑎,𝑘,𝑥   𝑌,𝑎,𝑘,𝑥   𝜑,𝑎,𝑘,𝑥
Allowed substitution hints:   𝐴(𝑥)   𝐷(𝑥, 𝑘, 𝑎)   𝐾(𝑘)   𝑉(𝑥, 𝑘, 𝑎)

Proof of Theorem hoidifhspf
StepHypRef Expression
1 hoidifhspf.a . . . . . 6 (𝜑𝐴:𝑋⟶ℝ)
21ffvelcdmda 7078 . . . . 5 ((𝜑𝑘𝑋) → (𝐴𝑘) ∈ ℝ)
3 hoidifhspf.y . . . . . 6 (𝜑𝑌 ∈ ℝ)
43adantr 486 . . . . 5 ((𝜑𝑘𝑋) → 𝑌 ∈ ℝ)
52, 4ifcld 4529 . . . 4 ((𝜑𝑘𝑋) → if(𝑌 ≤ (𝐴𝑘), (𝐴𝑘), 𝑌) ∈ ℝ)
65, 2ifcld 4529 . . 3 ((𝜑𝑘𝑋) → if(𝑘 = 𝐾, if(𝑌 ≤ (𝐴𝑘), (𝐴𝑘), 𝑌), (𝐴𝑘)) ∈ ℝ)
76fmpttd 7109 . 2 (𝜑 → (𝑘𝑋 ↦ if(𝑘 = 𝐾, if(𝑌 ≤ (𝐴𝑘), (𝐴𝑘), 𝑌), (𝐴𝑘))):𝑋⟶ℝ)
8 hoidifhspf.d . . . 4 𝐷 = (𝑥 ∈ ℝ ↦ (𝑎 ∈ (ℝ ↑m 𝑋) ↦ (𝑘𝑋 ↦ if(𝑘 = 𝐾, if(𝑥 ≤ (𝑎𝑘), (𝑎𝑘), 𝑥), (𝑎𝑘)))))
9 hoidifhspf.x . . . 4 (𝜑𝑋𝑉)
108, 3, 9, 1hoidifhspval2 47446 . . 3 (𝜑 → ((𝐷𝑌)‘𝐴) = (𝑘𝑋 ↦ if(𝑘 = 𝐾, if(𝑌 ≤ (𝐴𝑘), (𝐴𝑘), 𝑌), (𝐴𝑘))))
1110feq1d 6685 . 2 (𝜑 → (((𝐷𝑌)‘𝐴):𝑋⟶ℝ ↔ (𝑘𝑋 ↦ if(𝑘 = 𝐾, if(𝑌 ≤ (𝐴𝑘), (𝐴𝑘), 𝑌), (𝐴𝑘))):𝑋⟶ℝ))
127, 11mpbird 260 1 (𝜑 → ((𝐷𝑌)‘𝐴):𝑋⟶ℝ)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 401   = wceq 1570  wcel 2145  ifcif 4482   class class class wbr 5103  cmpt 5186  wf 6529  cfv 6533  (class class class)co 7414  m cmap 8829  cr 11126  cle 11271
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-pow 5330  ax-pr 5398  ax-un 7737  ax-cnex 11183  ax-resscn 11184
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 6489  df-fun 6535  df-fn 6536  df-f 6537  df-f1 6538  df-fo 6539  df-f1o 6540  df-fv 6541  df-ov 7417  df-oprab 7418  df-mpo 7419  df-map 8831
This theorem is used by:  hoidifhspdmvle  47451  hspmbllem1  47457  hspmbllem2  47458
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