

Arithmetic expressions  We will here point out that arithmetic expressions are written as fully parenthesized expressions with
prefix notation 
Scheme uses fully parenthesized arithmetic expressions with prefix notation 
 Prefix notation stands as a contrast to infix and postfix notation.
Infix notation is 'standard notation' in which the operand is found in between
the operands. 
 Examples of arithmetic expressions. The prefix notation can be seen to the left, and the values of the
expressions appear to the right. 
There is no need for priorities  operator precedence rules  of operators in fully parenthesized expressions 