Analyze the following concepts:
Arithmetic: A branch of mathematics that studies the properties, relations and operational rules of real numbers, including addition, subtraction, multiplication and division.
Calculation: the transformation process of related symbol strings and values according to certain rules. According to the known number, the unknown number is solved by mathematical method.
Operation: the process of finding the result of an expression according to mathematical rules.
Generally speaking, calculation is approximately equal to operation, and there is a branch of mathematics called "computational mathematics". Arithmetic belongs to calculation, and calculation belongs to mathematics. Calculation is a basic process that runs through the whole mathematics discipline and even all fields of natural science.