Mathematical term for the power to which a number or expression is raised.
In this expression, the exponent of x is 3.
指数 is a broader term meaning 'index' or 'exponent' in various contexts (e.g., stock index, exponential function). べき指数 specifically refers to the exponent in a power expression.
Standard modern spelling using the kana べき for the exponent part.
Older kanji form using 冪; still seen in some mathematical contexts but less common than べき指数.
Variant kanji form using 羃; very rare and mostly historical.
Compound of べき (power, exponent) and 指数 (index, exponent). The kanji 冪 and 羃 are older forms for 'power' in mathematics.