let N be non empty with_zero set ; :: thesis: for S being non empty with_non-empty_values IC-Ins-separated halting AMI-Struct over N
for p being NAT -defined the InstructionsF of b1 -valued Function
for s being State of S
for m being Nat holds
( p halts_on s iff p halts_on Comput (p,s,m) )
let S be non empty with_non-empty_values IC-Ins-separated halting AMI-Struct over N; :: thesis: for p being NAT -defined the InstructionsF of S -valued Function
for s being State of S
for m being Nat holds
( p halts_on s iff p halts_on Comput (p,s,m) )
let p be NAT -defined the InstructionsF of S -valued Function; :: thesis: for s being State of S
for m being Nat holds
( p halts_on s iff p halts_on Comput (p,s,m) )
let s be State of S; :: thesis: for m being Nat holds
( p halts_on s iff p halts_on Comput (p,s,m) )
let m be Nat; :: thesis: ( p halts_on s iff p halts_on Comput (p,s,m) )
hereby :: thesis: ( p halts_on Comput (p,s,m) implies p halts_on s )
assume p halts_on s ; :: thesis: p halts_on Comput (p,s,m)
then consider n being Nat such that
A1: IC (Comput (p,s,n)) in dom p and
A2: CurInstr (p,(Comput (p,s,n))) = halt S ;
reconsider n = n as Nat ;
per cases ( n <= m or n >= m ) ;
suppose n <= m ; :: thesis: p halts_on Comput (p,s,m)
then Comput (p,s,n) = Comput (p,s,(m + 0)) by A2, Th5
.= Comput (p,(Comput (p,s,m)),0) ;
hence p halts_on Comput (p,s,m) by A2, A1; :: thesis: verum
end;
suppose n >= m ; :: thesis: p halts_on Comput (p,s,m)
then reconsider k = n - m as Element of NAT by INT_1:5;
Comput (p,(Comput (p,s,m)),k) = Comput (p,s,(m + k)) by Th4
.= Comput (p,s,n) ;
hence p halts_on Comput (p,s,m) by A1, A2; :: thesis: verum
end;
end;
end;
given n being Nat such that A3: IC (Comput (p,(Comput (p,s,m)),n)) in dom p and
A4: CurInstr (p,(Comput (p,(Comput (p,s,m)),n))) = halt S ; :: according to EXTPRO_1:def 8 :: thesis: p halts_on s
reconsider nn = n as Nat ;
take m + nn ; :: according to EXTPRO_1:def 8 :: thesis: ( IC (Comput (p,s,(m + nn))) in dom p & CurInstr (p,(Comput (p,s,(m + nn)))) = halt S )
thus ( IC (Comput (p,s,(m + nn))) in dom p & CurInstr (p,(Comput (p,s,(m + nn)))) = halt S ) by A3, A4, Th4; :: thesis: verum