3-sphere two 3-balls. This construction is analogous to a construction of a 2-sphere, performed by gluing the boundaries of a pair of disks. A disk is a 2-ball, and the boundary of a disk is a circle (a 1-sphere). Let a pair of disks be of the same diameter. Superpose them and glue corresponding points on their boundaries. Again one may think of the third dimension as temperature. Likewise, we may inflate the 2-sphere, moving the pair of disks to become the northern and southern hemispheres. After removing a single point from the 2-sphere, what remains is homeomorphic to the Euclidean
Sphere (website) Sphere (website) Sphere was a blog search engine. The Sphere search engine delivered blog posts based on algorithms that combine semantic matching with authority factors to deliver results relevant to the search query. Sphere also organized bloggers by topic. The company produced an application called Sphere It! allowing users to seek blog posts related to news articles based on the contents of a particular web page they're viewing. The function was accessed from a browser navigation bar plug-in. Upon clicking the plug-in button, a semantic analysis was performed on the text within the page and blog posts related to the