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*Definition: sequence of length n over S*

sis a sequence of lengthnoverS: <=>s:N_{n}->S.

*Definition: length of a sequence*

length(s) :=

suchninN:existsS:sis a sequence of lengthnoverS.

*Definition: finite sequence*

sis a finite sequence overS: <=>

existsninN:sis a sequence of lengthnoverS.

*Definition: infinite sequence*

sis an infinite sequence overS: <=>s:N->S.

Author: Wolfgang Schreiner

Last Modification: October 14, 1999