| ### 4.15.3 number operations `+` addition `-` negation or subtraction `*` multiplication `/` division `%`, `mod` modulo `^`, `**` power, exponentiation (by an integer) `<=, >=, ==, <>` comparison `mod` integer modulo (the remainder of the division `div`), always non-negative Note: Quotient and exponentiation is only recognized as a number expression if it is already a number, see Miscellaneous oddities. For the behavior of comparison operators in rings with ground field different from real or the rational numbers, see boolean expressions. Example:
      ring r=0,x,dp;
      number n = 1/2 +1/3;
      n;
    ==> 5/6
      n/2;
    ==> 5/12
      1/2/3;
    ==> 1/6
      1/2 * 1/3;
    ==> 1/6
      n = 2;
      n^-2;
    ==> 1/4
      // the following oddities appear here
      2/(2+3);
    ==> // ** int division with `/`: use `div` instead in line >>  2/(2+3);<<
    ==> 0
      number(2)/(2+3);
    ==> 2/5
      2^-2; // for int's exponent must be non-negative
    ==>    ? exponent must be non-negative
    ==>    ? error occurred in or before ./examples/number_operations.sing line 1\
       2: `  2^-2; // for int's exponent must be non-negative`
      number(2)^-2;
    ==> 1/4
      3/4>=2/5;
    ==> 1
      2/6==1/3;
    ==> 1

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