Let X be a linear space, and \(x, y \in X\). The x, y joining x and y is defined x, y = \(\{\lambda x + (1- \lambda)y: 0 \leq \lambda \leq 1\}\).

Let X be a linear space, and \(x, y \in X\). The [x, y] joining x and y is defined [x, y] = \(\{\lambda x + (1- \lambda)y: 0 \leq \lambda \leq 1\}\).

linear space

—>> line segment

subset

vector