fourfold

Noun

(mathematics) An algebraic variety of degree 4.

Japanese Meaning

数学において、次数が4の代数多様体。

The algebraists examined a singular fourfold defined by a homogeneous polynomial of degree four.

代数学者たちは、斉次多項式で定義される特異な四次多様体を調べた。

Sense（1）

(mathematics) An algebraic variety of degree 4.

Our main application is to the classification of Poisson brackets on Fano fourfolds.

fourfolds

（ plural ）