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specialp(expression) → boolean
The subroutine specialp takes a constant as argument and determines whether or not it is a predefined function or relation in Epilog. If the specified expression predefined, specialp returns true; otherwise, it returns false.
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Call: specialp('same')
Exit: true
Call: specialp('distinct')
Exit: true
Call: specialp('evaluate')
Exit: true
Call: specialp('member')
Exit: true
Call: specialp('true')
Exit: true
Call: specialp('plus')
Exit: true
Call: specialp('times')
Exit: true
Call: specialp('stringappend')
Exit: true
Call: specialp('stringify')
Exit: true
Call: specialp('listify')
Exit: true
Call: specialp('map')
Exit: true
Call: specialp('setofall')
Exit: true
Call: specialp('countofall')
Exit: true
Call: specialp('a23')
Exit: false
Call: specialp('not')
Exit: false
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Special constants differ from operators in that operators have special syntax whereas special constants are used as ordinary functions and relations.
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