MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  muval Structured version   Visualization version   GIF version

Theorem muval 24858
Description: The value of the Möbius function. (Contributed by Mario Carneiro, 22-Sep-2014.)
Assertion
Ref Expression
muval (𝐴 ∈ ℕ → (μ‘𝐴) = if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴}))))
Distinct variable group:   𝐴,𝑝

Proof of Theorem muval
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 breq2 4657 . . . 4 (𝑥 = 𝐴 → ((𝑝↑2) ∥ 𝑥 ↔ (𝑝↑2) ∥ 𝐴))
21rexbidv 3052 . . 3 (𝑥 = 𝐴 → (∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝑥 ↔ ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴))
3 breq2 4657 . . . . . 6 (𝑥 = 𝐴 → (𝑝𝑥𝑝𝐴))
43rabbidv 3189 . . . . 5 (𝑥 = 𝐴 → {𝑝 ∈ ℙ ∣ 𝑝𝑥} = {𝑝 ∈ ℙ ∣ 𝑝𝐴})
54fveq2d 6195 . . . 4 (𝑥 = 𝐴 → (#‘{𝑝 ∈ ℙ ∣ 𝑝𝑥}) = (#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴}))
65oveq2d 6666 . . 3 (𝑥 = 𝐴 → (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝑥})) = (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴})))
72, 6ifbieq2d 4111 . 2 (𝑥 = 𝐴 → if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝑥, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝑥}))) = if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴}))))
8 df-mu 24827 . 2 μ = (𝑥 ∈ ℕ ↦ if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝑥, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝑥}))))
9 c0ex 10034 . . 3 0 ∈ V
10 ovex 6678 . . 3 (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴})) ∈ V
119, 10ifex 4156 . 2 if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴}))) ∈ V
127, 8, 11fvmpt 6282 1 (𝐴 ∈ ℕ → (μ‘𝐴) = if(∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴, 0, (-1↑(#‘{𝑝 ∈ ℙ ∣ 𝑝𝐴}))))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1483  wcel 1990  wrex 2913  {crab 2916  ifcif 4086   class class class wbr 4653  cfv 5888  (class class class)co 6650  0cc0 9936  1c1 9937  -cneg 10267  cn 11020  2c2 11070  cexp 12860  #chash 13117  cdvds 14983  cprime 15385  μcmu 24821
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-mulcl 9998  ax-i2m1 10004
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-ov 6653  df-mu 24827
This theorem is referenced by:  muval1  24859  muval2  24860  isnsqf  24861  mule1  24874
  Copyright terms: Public domain W3C validator