Arithmetic functions are generally intuitive, so long as you understand that the function identifier
comes first (as it does with all BioBIKE functions), and only then comes the arguments.

  Addition   (+ list of numbers to be added)
      Example:   (+ 3 29 47)   ==> 79

  Subtraction   (- minuend   list of subtrahends)
      Example:   (- 3 29 47)   ==> -73

  Multiplication   (* list of numbers to be multiplied
      Example:   (* 3 29 47)   ==> 4089

  Division   (/ dividend   list of divisors)
      Examples:  (/ 3 29 47)    ==> 3/1363
            (/ 3 29 47.0)  ==> 0.0022010272

  Increment   (INCREMENT variable)
      Examples:  (INCREMENT x)    ==> 1 + previous value of x (or 1, if x did not have a value)
            (INCREMENT pos 3)  ==> 3 + previous value of pos (or 3, if pos did not have a value)
            (INCREMENT list-of-values)  ==> 1 + previous value of each element within the list

  Summation   (SUM-OF list-of-numbers)
      Examples:  (SUM-OF (LIST-OF-NUMBERS FROM 1 TO 10))    ==> 55
            (SUM-OF (LENGTHS-OF (GENES-OF A7120)))  ==>

  Exponentiation (e^x)   (EXP number)
      Example: (EXP 1)    ==> 2.7182817

  Exponentiation (b^x)   (EXPT base   power)
      Example:  (EXPT 3 4)    ==> 81

  Square root   (SQRT number)
      Example:   (SQRT 2)    ==> 1.4142135

  Natural log  (LOG number)
      Example:   (LOG 10)    ==> 2.3025851

  Log (base 10)  (LOG10 number)
      Example:  (LOG10 100)   ==> 2

  Log (base 2)  (LOG2 number)
      Example:  (LOG2 64)   ==> 6

  Log (any base)  (LOG number  base)
      Example:  (LOG 100 10)   ==> 2