Assertion: bottle's side | /r/HasProperty | relation
Facets:
Source sentences:
text: More formally, the Klein bottle is the quotient space described as the square  ×  with sides identified by the relations (0, y) ~ (1, y) for 0 ≤ y ≤ 1 and (x, 0) ~ (1 − x, 1) for 0 ≤ x ≤ 1.