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Theorem hausflf 24224
Description: If a function has its values in a Hausdorff space, then it has at most one limit value. (Contributed by FL, 14-Nov-2010.) (Revised by Stefan O'Rear, 6-Aug-2015.)
Hypothesis
Ref Expression
hausflf.x 𝑋 = 𝐽
Assertion
Ref Expression
hausflf ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → ∃*𝑥 𝑥 ∈ ((𝐽 fLimf 𝐿)‘𝐹))
Distinct variable groups:   𝑥,𝐹   𝑥,𝐽   𝑥,𝐿   𝑥,𝑋   𝑥,𝑌

Proof of Theorem hausflf
StepHypRef Expression
1 hausflimi 24207 . . 3 (𝐽 ∈ Haus → ∃*𝑥 𝑥 ∈ (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿)))
213ad2ant1 1151 . 2 ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → ∃*𝑥 𝑥 ∈ (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿)))
3 haustop 23557 . . . . . 6 (𝐽 ∈ Haus → 𝐽 ∈ Top)
4 hausflf.x . . . . . . 7 𝑋 = 𝐽
54toptopon 23143 . . . . . 6 (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘𝑋))
63, 5sylib 221 . . . . 5 (𝐽 ∈ Haus → 𝐽 ∈ (TopOn‘𝑋))
7 flfval 24217 . . . . 5 ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → ((𝐽 fLimf 𝐿)‘𝐹) = (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿)))
86, 7syl3an1 1181 . . . 4 ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → ((𝐽 fLimf 𝐿)‘𝐹) = (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿)))
98eleq2d 2848 . . 3 ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → (𝑥 ∈ ((𝐽 fLimf 𝐿)‘𝐹) ↔ 𝑥 ∈ (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿))))
109mobidv 2576 . 2 ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → (∃*𝑥 𝑥 ∈ ((𝐽 fLimf 𝐿)‘𝐹) ↔ ∃*𝑥 𝑥 ∈ (𝐽 fLim ((𝑋 FilMap 𝐹)‘𝐿))))
112, 10mpbird 260 1 ((𝐽 ∈ Haus ∧ 𝐿 ∈ (Fil‘𝑌) ∧ 𝐹:𝑌𝑋) → ∃*𝑥 𝑥 ∈ ((𝐽 fLimf 𝐿)‘𝐹))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  w3a 1103   = wceq 1570  wcel 2145  ∃*wmo 2564   cuni 4870  wf 6533  cfv 6537  (class class class)co 7416  Topctop 23119  TopOnctopon 23136  Hauscha 23534  Filcfil 24072   FilMap cfm 24160   fLim cflim 24161   fLimf cflf 24162
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 2215  ax-ext 2734  ax-rep 5236  ax-sep 5255  ax-nul 5267  ax-pow 5334  ax-pr 5402  ax-un 7739
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 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-nel 3064  df-ral 3079  df-rex 3089  df-reu 3368  df-rab 3415  df-v 3455  df-sbc 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-pw 4562  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4871  df-iun 4956  df-br 5108  df-opab 5172  df-mpt 5191  df-id 5554  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-ov 7419  df-oprab 7420  df-mpo 7421  df-map 8831  df-fbas 21583  df-top 23120  df-topon 23137  df-nei 23324  df-haus 23541  df-fil 24073  df-flim 24166  df-flf 24167
This theorem is used by:  hausflf2  24225  cnextfun  24291  haustsms  24363  limcmo  26111
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