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  2. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    The repeating sequence of digits is called "repetend" which has a certain length greater than 0, also called "period". [5] In base 10, a fraction has a repeating decimal if and only if in lowest terms, its denominator has any prime factors besides 2 or 5, or in other words, cannot be expressed as 2 m 5 n, where m and n are non-negative integers.

  3. Quantile function - Wikipedia

    en.wikipedia.org/wiki/Quantile_function

    The probit is the quantile function of the normal distribution.. In probability and statistics, the quantile function outputs the value of a random variable such that its probability is less than or equal to an input probability value.

  4. Atomic ratio - Wikipedia

    en.wikipedia.org/wiki/Atomic_ratio

    In laser physics however, the atomic ratio may refer to the doping ratio or the doping fraction. For example, theoretically, a 100% doping ratio of Yb : Y 3 Al 5 O 12 is pure Yb 3 Al 5 O 12 . The doping fraction equals,

  5. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Half-life (symbol t ½) is the time required for a quantity (of substance) to reduce to half of its initial value.The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive.

  6. Rational function - Wikipedia

    en.wikipedia.org/wiki/Rational_function

    This is useful in solving such recurrences, since by using partial fraction decomposition we can write any proper rational function as a sum of factors of the form 1 / (ax + b) and expand these as geometric series, giving an explicit formula for the Taylor coefficients; this is the method of generating functions.

  7. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.