0×31

0×31 is an arithmetic expression representing the product of zero and thirty-one. In standard arithmetic, multiplying any number by zero yields zero, so 0×31 = 0. This reflects the absorbing property of zero under multiplication and applies to integers, rationals, reals, and complex numbers.

From a theoretical perspective, the result follows from the definition of multiplication as repeated addition: adding zero thirty-one times gives zero. The property 0×a = 0 for any a is fundamental in many areas of mathematics and underpins consistent algebraic structures, including rings and fields that contain a zero element.

Note that the symbol × can be confused with the character used to denote hexadecimal literals in programming. The string 0x31 (with a lowercase x) is a common hex notation meaning the value 0x31 in hexadecimal, which equals 49 in decimal. The same byte corresponds to the ASCII or Unicode character '1' (code point U+0031). Thus, 0×31 and 0x31 are distinct representations and should not be interchanged without care.

In summary, 0×31 is primarily a statement of the zero-multiplication rule, yielding zero, while 0x31 is a hexadecimal constant with numeric value 49 in decimal and specific character-encoding significance in computing.