英和和英

名詞

square root (複数形 square roots)

1. (mathematics) The number which, when squared, yields another number.

   The square roots of 4 are 2 and −2, the square root of 0 is 0, and the square roots of −4 are 2i and −2i.

   • a. 1992, Frederick Mosteller, “Writing about Numbers”, in John C. Bailar III, Frederick Mosteller, editors, Medical Uses of Statistics‎^[1], second edition, published 1992, page 388:

     In √a̅+̅b̅, the horizontal bar or vinculum is actually a parenthesis that groups a+b. Without it, √a+b might mean b+√a̅ or it might mean √a̅+̅b̅. Nevertheless, the square-root sign without the vinculum is often used […] .

2. (mathematics) The positive number which, when squared, yields another number; the principal square root.

   The square root of 4 is 2. No negative real square roots exist. Negative numbers have no real square roots.