The abuttal operator is assumed between two terms that are not separated by another operator. This can occur when two terms are syntactically distinct, such as a literal string and a symbol, or when they are separated only by a comment.
Examples:
An example of syntactically distinct terms is: if Fred has the value 37.4, then Fred'%' evaluates to 37.4%.
If the variable PETER has the value 1, then (Fred)(Peter) evaluates to 37.41.
'c1 c2'x'CDE'
evaluate to ABCDE. Fred/* The NOT operator precedes Peter. */¬Peter
there is no abuttal operator implied, and the expression is
not valid. However,
(Fred)/* The NOT operator precedes Peter. */(¬Peter)
results in an abuttal, and evaluates to 37.40.