Emil Post modified one of these constructs to use a symbol space and a two-way infinite sequence of boxes, while another modification of these constructs use an oracle to tell it when to go after stopping at state o.
Emil Post modified one of these constructs to use a symbol space and a two-way infinite sequence of boxes, while another modification of these constructs use an oracle to tell it when to go after stopping at state o. One that reads a blank symbol and halts after a time is known as the busy beaver, and one of these constructs exists for every terminating algorithm according to the thesis of their namesake and Church.  Consisting of a table, a read head, and a tape, FTP, name these simple constructs, named for the guy who decoded the German Enigma cypher and killed himself with a poisoned apple.
Emil Post modified one of these constructs to use a symbol space and a two-way infinite sequence of boxes, while another modification of these constructs use an oracle to tell it when to go after stopping at state o.
Turing machine