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Theorem harword 9322
Description: Weak ordering property of the Hartogs function. (Contributed by Stefan O'Rear, 14-Feb-2015.)
Assertion
Ref Expression
harword (𝑋𝑌 → (har‘𝑋) ⊆ (har‘𝑌))

Proof of Theorem harword
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 domtr 8793 . . . . 5 ((𝑦𝑋𝑋𝑌) → 𝑦𝑌)
21expcom 414 . . . 4 (𝑋𝑌 → (𝑦𝑋𝑦𝑌))
32adantr 481 . . 3 ((𝑋𝑌𝑦 ∈ On) → (𝑦𝑋𝑦𝑌))
43ss2rabdv 4009 . 2 (𝑋𝑌 → {𝑦 ∈ On ∣ 𝑦𝑋} ⊆ {𝑦 ∈ On ∣ 𝑦𝑌})
5 reldom 8739 . . . 4 Rel ≼
65brrelex1i 5643 . . 3 (𝑋𝑌𝑋 ∈ V)
7 harval 9319 . . 3 (𝑋 ∈ V → (har‘𝑋) = {𝑦 ∈ On ∣ 𝑦𝑋})
86, 7syl 17 . 2 (𝑋𝑌 → (har‘𝑋) = {𝑦 ∈ On ∣ 𝑦𝑋})
95brrelex2i 5644 . . 3 (𝑋𝑌𝑌 ∈ V)
10 harval 9319 . . 3 (𝑌 ∈ V → (har‘𝑌) = {𝑦 ∈ On ∣ 𝑦𝑌})
119, 10syl 17 . 2 (𝑋𝑌 → (har‘𝑌) = {𝑦 ∈ On ∣ 𝑦𝑌})
124, 8, 113sstr4d 3968 1 (𝑋𝑌 → (har‘𝑋) ⊆ (har‘𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1539  wcel 2106  {crab 3068  Vcvv 3432  wss 3887   class class class wbr 5074  Oncon0 6266  cfv 6433  cdom 8731  harchar 9315
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-rmo 3071  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-se 5545  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-isom 6442  df-riota 7232  df-ov 7278  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-en 8734  df-dom 8735  df-oi 9269  df-har 9316
This theorem is referenced by:  hsmexlem3  10184
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