Let $P = (\mathbb{R}, {<})$ be the D1101: Strictly ordered set of real numbers such that

(i)	$a, b \in \mathbb{R}$ are each a D993: Real number

The left-closed real interval from $a$ to $b$ is the D11: Set $$\begin{equation} [a, b) : = \{ x \in \mathbb{R} : a \leq x < b \} \end{equation}$$