A transducer emitting a single output tape, i.e. the trivial single-sequence instance of a string transducer that is equivalent to an HMM with one output and only one emitting state. See Transducer Legend for key to diagram.
- g + h = 1.
Note the built-in S/I symmetry of this model.
We can write this as denoting the replacement of an empty (dummy) input sequence with a possibly nonempty output sequence which occurs if the reversible evolutionary process is allowed to run forever (compare with the symbol for the Gotoh Transducer which represents a finite time interval ).
-- Ian Holmes - 25 Feb 2007