Surface - Closed Surfaces

Closed Surfaces

A closed surface is a surface that is compact and without boundary. Examples are spaces like the sphere, the torus and the Klein bottle. Examples of non-closed surfaces are: an open disk, which is a sphere with a puncture; a cylinder, which is a sphere with two punctures; and the Möbius strip.

Read more about this topic:  Surface

Famous quotes containing the words closed and/or surfaces:

    “Pray but one prayer for me ‘twixt thy closed lips,
    Think but one thought of me up in the stars.”
    —William Morris (1834–1896)

    “Footnotes are the finer-suckered surfaces that allow tentacular paragraphs to hold fast to the wider reality of the library.”
    —Nicholson Baker (b. 1957)