There are prefix unary operators, such as unary minus-x, and postfix unary operators, such as post-increment x + +; and binary operations are infix, such as x + y or x = y.
12.
The SQL standard contains an extension F571 " Truth value tests " that introduces three additional logical unary operators ( six in fact, if we count their negation, which is part of their syntax ), also using postfix notation.
13.
The reasoning behind the'accessibility relation'uses the basics of'propositional modal logic'( see modal logic for a detailed discussion ) .'Propositional modal logic'is traditional propositional logic with the addition of two key unary operators:
14.
These are not unary operators syntactically they are lexically part of the identifier, and have different semantics, such as indicating the data type of the identifier but are syntactically similar to the dereference operator and can be confused with it.
15.
Wheels discard the usual notion of division being a unary operator / x similar ( but not identical ) to the multiplicative inverse x ^ {-1 }, such that a / b becomes shorthand for a \ cdot / b = / b \ cdot a, and modifies the rules of algebra such that
16.
Indeed, one might define the unary operator O in terms of the binary conditional one O ( A / B ) as OA \ equiv O ( A / \ top ), where \ top stands for an arbitrary tautology of the underlying logic ( which, in the case of "'SDL "', is classical ).
17.
The translation between modal logics and algebraic logics concerns classical and intuitionistic logics but with the introduction of a unary operator on Boolean or Heyting algebras, different from the Boolean operations, interpreting the possibility modality, and in the case of Heyting algebra a second operator interpreting necessity ( for Boolean algebra this is redundant since necessity is the De Morgan dual of possibility ).
18.
When the temperature drops to less than zero in English, most of us will say, " It's minus ten . " ( Mathematical purists will argue for " It's negative ten " because negative is a unary operator, whilst minus is binary, but that's not part of the question, and I wanted to head it off early . ) The next most common usage is probably " It's ten below zero ", and colloquially often reduced even further, even on the evening news, to just " It's ten below ."
19.
Since " $ 4 " is the value of the fourth field, " $ NF " is the value of the last field in the line regardless of how many fields this line has, or whether it has more or fewer fields than surrounding lines . $ is actually a unary operator with the highest operator precedence . ( If the line has no fields, then " NF " is 0, " $ 0 " is the whole line, which in this case is empty apart from possible white-space, and so has the numeric value 0 .)
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