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自然投影[Natural Projection] [2005-8-11]
iamet 发表在 ∑〖数学〗
| The natural projection, also called the homomorphism, is a logical way of mapping an algebraic structure onto its quotient structures. The natural projection  is defined formally for groups and rings as follows.
For a group, let  . is defined by  . Note  (Dummit and Foote 1998, p. 84).
For a ring, let  be an ideal of a ring  . is defined be  . Note  (Dummit and Foote 1998, p. 244). |
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