Introduced tuples of arbitrary length, tuple datatypes for lengths 2 … #16
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…to 5 are predefined.
In particular, a procedure (define-tuple-datatype n) has been introduced in util.ath that takes any integer numeral n >= 1 and defines a datatype of the form:
datatype (n-Tuple S_1 ... S_n) := (n-tuple n-tuple-1:S_1 ... n-tuple-n:S_n)
Thus, for instance,
define t := (3-tuple 'a 5 false)
Term: (= (3-tuple 'a 5 false)
?x:(3-Tuple Ide Int Boolean))
Term: 5