Null Space -- from Wolfram MathWorld
https://mathworld.wolfram.com/NullSpace.html27.01.2022 · Null Space. If is a linear transformation of , then the null space Null ( ), also called the kernel , is the set of all vectors such that. The term "null space" is most commonly written as two separate words (e.g., Golub and Van Loan 1989, pp. 49 and 602; Zwillinger 1995, p. 128), although other authors write it as a single word "nullspace" (e ...