Assertion: isometry's point | /r/HasProperty | \displaystyle x
Facets:
Source sentences:
text: About any point x {\displaystyle x} in a metric space M {\displaystyle M} we define the open ball of radius r > 0 {\displaystyle r>0} (where r {\displaystyle r} is a real number) about x {\displaystyle x} as the set