可决定性Assignment Help

beplay体育怎么安装分配帮助:>>Automata>> Decidability

可决定和不可决定的问题:

接受:

Definition

  • lett=((,,,,Σ, Γ, δ,sbe a TM.
  • taccepts the stringwin Σ * if (s,δw)| -t* (H,,,,Δ1)。
  • t接受语言lΣ⊆* if, for any stringwinl,,,,tacceptsw

特征功能

  • For any languagelΣ⊆*, the characteristic function of L is function Χl((X) 以便

-

ΧL((X)= 1

ifXl

-

ΧL((X)= 0

otherwise

  • Example

letl={w∈{0,1}* | n1(ω)

-

Cl((ω) = 1

if n1(ω)

-

Cl((ω) = 0

otherwise

Deciding: Definition

  • lett=((,,,,Σ, Γ, δ,s)be a TM.
  • tdecides a languagelΣ⊆* iftCalculates the characteristic function ofl
  • tdecides a languagelΣ⊆* if

- 对于任何字符串ωl,,,,tstops on w with output 1,

-for any string ωin'l,,,,tHalts on w with output

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