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Theorem oldf 28253
Description: The older function is a function from ordinals to sets of surreals. (Contributed by Scott Fenton, 6-Aug-2024.)
Assertion
Ref Expression
oldf O:On⟶𝒫 No

Proof of Theorem oldf
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-old 28244 . 2 O = (𝑥 ∈ On ↦ ∪ (M “ 𝑥))
2 imassrn 6210 . . . . . . . 8 (M “ 𝑥) ⊆ ran M
3 madef 28252 . . . . . . . . 9 M:On⟶𝒫 No
4 frn 6739 . . . . . . . . 9 (M:On⟶𝒫 No → ran M ⊆ 𝒫 No)
53, 4ax-mp 5 . . . . . . . 8 ran M ⊆ 𝒫 No
62, 5sstri 3922 . . . . . . 7 (M “ 𝑥) ⊆ 𝒫 No
76sseli 3909 . . . . . 6 (𝑦 ∈ (M “ 𝑥) → 𝑦 ∈ 𝒫 No)
87elpwid 4569 . . . . 5 (𝑦 ∈ (M “ 𝑥) → 𝑦 ⊆ No)
98rgen 3082 . . . 4 ∀𝑦 ∈ (M “ 𝑥)𝑦 ⊆ No
109a1i 11 . . 3 (𝑥 ∈ On → ∀𝑦 ∈ (M “ 𝑥)𝑦 ⊆ No)
11 ffun 6734 . . . . . . . 8 (M:On⟶𝒫 No → Fun M)
123, 11ax-mp 5 . . . . . . 7 Fun M
13 vex 3458 . . . . . . . 8 𝑥 ∈ V
1413funimaex 6649 . . . . . . 7 (Fun M → (M “ 𝑥) ∈ V)
1512, 14ax-mp 5 . . . . . 6 (M “ 𝑥) ∈ V
1615uniex 7782 . . . . 5 ∪ (M “ 𝑥) ∈ V
1716elpw 4564 . . . 4 (∪ (M “ 𝑥) ∈ 𝒫 No ↔ ∪ (M “ 𝑥) ⊆ No)
18 unissb 4904 . . . 4 (∪ (M “ 𝑥) ⊆ No ↔ ∀𝑦 ∈ (M “ 𝑥)𝑦 ⊆ No)
1917, 18bitri 278 . . 3 (∪ (M “ 𝑥) ∈ 𝒫 No ↔ ∀𝑦 ∈ (M “ 𝑥)𝑦 ⊆ No)
2010, 19sylibr 237 . 2 (𝑥 ∈ On → ∪ (M “ 𝑥) ∈ 𝒫 No)
211, 20fmpti 7136 1 O:On⟶𝒫 No
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∈ wcel 2147  ∀wral 3080  Vcvv 3454   ⊆ wss 3900  𝒫 cpw 4560  ∪ cuni 4870  ran crn 5656   “ cima 5658  Oncon0 6380  Fun wfun 6552  ⟶wf 6554  Nocsur 28027  Mcmade 28238  Ocold 28239
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5235  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7775
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-tp 4593  df-op 4839  df-uni 4871  df-int 4911  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  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-pred 6322  df-ord 6383  df-on 6384  df-suc 6386  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-riota 7400  df-ov 7446  df-oprab 7447  df-mpo 7448  df-2nd 8026  df-frecs 8327  df-wrecs 8358  df-recs 8407  df-1o 8504  df-2o 8505  df-no 28030  df-lts 28031  df-bday 28032  df-slts 28174  df-cuts 28176  df-made 28243  df-old 28244
This theorem is used by:  oldssno  28257  leftf  28271  rightf  28272  oldssmade  28283  oldss  28286  oldlim  28303  oldbdayim  28305
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