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Mirrors > Home > MPE Home > Th. List > Mathboxes > bdayval | Structured version Visualization version GIF version |
Description: The value of the birthday function within the surreals. (Contributed by Scott Fenton, 14-Jun-2011.) |
Ref | Expression |
---|---|
bdayval | ⊢ (𝐴 ∈ No → ( bday ‘𝐴) = dom 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmexg 7615 | . 2 ⊢ (𝐴 ∈ No → dom 𝐴 ∈ V) | |
2 | dmeq 5774 | . . 3 ⊢ (𝑥 = 𝐴 → dom 𝑥 = dom 𝐴) | |
3 | df-bday 33154 | . . 3 ⊢ bday = (𝑥 ∈ No ↦ dom 𝑥) | |
4 | 2, 3 | fvmptg 6768 | . 2 ⊢ ((𝐴 ∈ No ∧ dom 𝐴 ∈ V) → ( bday ‘𝐴) = dom 𝐴) |
5 | 1, 4 | mpdan 685 | 1 ⊢ (𝐴 ∈ No → ( bday ‘𝐴) = dom 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 Vcvv 3496 dom cdm 5557 ‘cfv 6357 No csur 33149 bday cbday 33151 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 ax-un 7463 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-iota 6316 df-fun 6359 df-fv 6365 df-bday 33154 |
This theorem is referenced by: nofnbday 33161 fvnobday 33185 nodenselem5 33194 nodense 33198 nosupno 33205 nosupbday 33207 noetalem3 33221 noetalem4 33222 |
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