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RegularChains[ChainTools][RemoveRedundantComponents] - remove redundant quasi-components from a list of regular chains
RegularChains[SemiAlgebraicSetTools][RemoveRedundantComponents] - remove redundant quasi-components from a list of regular semi-algebraic systems
Calling Sequence
RemoveRedundantComponents(lrc, R)
RemoveRedundantComponents(lrsas, R)
Parameters
lrc
-
list of regular chains
lrsas
list of regular semi-algebraic systems
R
polynomial ring
Description
The command RemoveRedundantComponents(lrc, R) returns a list of regular chains whose quasi-components are pairwise noninclusive and such that lrc and are Lazard decompositions of the same algebraic variety. Consequently, this command removes from those quasi-components that are redundant for inclusion.
The command RemoveRedundantComponents(lrsas, R) returns a list of regular semi-algebraic system whose zero sets are pairwise noninclusive, and such that lrsas and have the same zero set.
For more details, see Algorithm 35 in the Ph.D. thesis of Yuzhen Xie.
Compatibility
The RegularChains[SemiAlgebraicSetTools][RemoveRedundantComponents] command was introduced in Maple 16.
The lrsas parameter was introduced in Maple 16.
For more information on Maple 16 changes, see Updates in Maple 16.
Examples
Consider a polynomial ring with two variables
Consider two regular chains in R
The solutions of one are contained in those of the other. The redundant one will be removed as follows
The case of semi-algebraic system.
See Also
ChainTools, EqualSaturatedIdeals, IsContained, IsIncluded, IsInSaturate, PolynomialRing, RegularChains
References
Xie, Y. "Fast Algorithms, Modular Methods, Parallel Approaches and Software Engineering for Solving Polynomial Systems Symbolically" Ph.D. Thesis, University of Western Ontario, Canada, 2007.
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