Infinity
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Infinity is something which is boundless, endless, or larger than any natural number. It is often denoted by the infinity symbol .
Due to the constant light reflection between opposing mirrors, it seems that there is a boundless amount of space and repetition inside of them.
Division by zero
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In mathematics, division by zero, division where the divisor (denominator) is zero, is a unique and problematic special case. Using fraction notation, the general example can be written as , where is the dividend (numerator).
Handheld calculators, such as this TI-86, typically halt and display an error message after an attempt to divide by zero.