assert $(math 1)   is 1
assert $(math 1+2) is 3
assert $(math 1-2) is -1
assert $(math 2*3) is 6
assert $(math 8/2) is 4
assert $(math 3/2) is 1
assert $(math 2^2) is 4
assert $(math 2^3) is 8
assert $(math -1 * -1) is 1
assert $(math -1 / -1) is 1
assert $(math 1 + 2 * 3) is 7