Hello. I have some questions on operations. Suppose in the course of a derivation there is a mathematical statement of the form A+1=B+C then "+" is an operator acting on inputs "B" and "C". Question 1: Is the output of the operation "A" or the expression "B+C"? The reason I think the output may be "B+C" is because in the statement X=(Y+Z)+W, wouldn't the output of the first addition be Y+Z? Question 2: Since the equals sign "=" has two inputs, the left hand side (LHS) and right hand side (RHS) expressions, is it also an operator? How does one distinguish whether A+1 is the input or B+C is the input? If "=" is an operator, what is the output? If "=" is not an operator, what is it?