It is possible to invent a single machine which
can be used to compute computable sequence.
If this machine U is supplied with a tape
on the beginning of which is written
the S.D ["standard description" of an action table]
of some computing machine M, then U will compute
the same sequence as M.

- Description of what's now UTM by Alan Turing in his 1936 paper.

Last Updated on Tuesday, January 16 2024