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The fitted sheet may also be secured using a drawstring instead of elastic. The purpose of a fitted bottom sheet is to keep it from slipping off the mattress while the bed is in use. A particular way of folding and tucking while making the bed, known as "hospital corners," is sometimes used when the bottom sheet is flat rather than fitted.
Fitted sheet: This is the bottom sheet used to fit tightly over a mattress. Fitted sheets are available in a variety of pocket depths, which refers to the thickness of the mattress. Standard North American pocket size is 7 to 9 in (18 to 23 cm). Deep pocket corners are usually 10 to 13 in (25 to 33 cm).
There are two types of extended symmetries by adding mirrors: <[3,3 1,1]> which becomes [4,3,3] by bisecting the fundamental domain by a mirror, with 3 orientations possible; and the full extended group [3[3 1,1,1]] becomes [3,4,3].
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The symmetry group of the tiling is the (2,3,7) triangle group, and a fundamental domain for this action is the (2,3,7) Schwarz triangle.This is the smallest hyperbolic Schwarz triangle, and thus, by the proof of Hurwitz's automorphisms theorem, the tiling is the universal tiling that covers all Hurwitz surfaces (the Riemann surfaces with maximal symmetry group), giving them a triangulation ...
v3.3.3.3.7 It is topologically related to a polyhedra sequence; see discussion . This group is special for having all even number of edges per vertex and form bisecting planes through the polyhedra and infinite lines in the plane, and are the reflection domains for the (2,3, n ) triangle groups – for the heptagonal tiling, the important (2,3 ...
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