Structures can be either man-made or natural. Man-made structures are made by people hence the term man-made. Examples include a bicycle, chair, crane. Natural structures are found in the environment.
SIAM Journal on Applied Mathematics, Vol. 33, No. 1 (Jul., 1977), pp. 51-54 (4 pages) Homology groups are important topological invariants of discrete structures. In this paper we present efficient ...
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