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--1 Symbolic expressions
-- *Note*. This module is not automatically included in the main
-- grammar [Lang Lang.html].
abstract Symbol = Cat, PredefAbs ** {
--2 Noun phrases with symbols and numbers
fun
SymbPN : Symb -> PN ; -- x
IntPN : Int -> PN ; -- 27
FloatPN : Float -> PN ; -- 3.14159
NumPN : Card -> PN ;
CNNumNP : CN -> Card -> NP ; -- level five ; level 5
CNSymbNP : Det -> CN -> [Symb] -> NP ; -- (the) (2) numbers x and y
--2 Sentence consisting of a formula
SymbS : Symb -> S ; -- A
--2 Symbols as numerals
SymbNum : Symb -> Card ; -- n
SymbOrd : Symb -> Ord ; -- n'th
--2 Symbol lists
-- A symbol list has at least two elements. The last two are separated
-- by a conjunction ("and" in English), the others by commas.
-- This produces "x, y and z", in English.
cat
Symb ;
[Symb]{2} ;
fun
MkSymb : String -> Symb ;
--2 Obsolescent
CNIntNP : CN -> Int -> NP ; -- level 53 (covered by CNNumNP)
}
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