Definition:Letter T

Definition
The letter $\mathsf T$ is the topological subspace of the real number plane $\R^2$ under the Euclidean topology defined as:


 * $\mathsf T := \paren {\closedint {-1} 1 \times \set 0} \cup \paren {\set 0 \times \closedint 0 1}$


 * Letter-T.png

Also see

 * Definition:Letter L