Difference between revisions of "Category:Package diffalg"

From CoCoAWiki
(Description update.)
Line 1: Line 1:
The package diffalg provides basic functionality for computations within differential polynomial rings in n indeterminates over the field of rationals, Q. Currently, these rings are realized by using doubly indexed indeterminates where the first index distinguishes the indeterminates <math>x_1,\dots,x_n</math> and the second index denotes the order of the corresponding derivative.
+
The package diffalg provides basic functionality for computations within differential polynomial rings in <math>n</math> indeterminates over the field of rationals, Q. Currently, these rings are realized by using doubly indexed indeterminates where the first index distinguishes the indeterminates <math>x_1,\dots,x_n</math> and the second index denotes the order of the corresponding derivative.
  
 
==Example==
 
==Example==

Revision as of 13:42, 3 September 2013

The package diffalg provides basic functionality for computations within differential polynomial rings in indeterminates over the field of rationals, Q. Currently, these rings are realized by using doubly indexed indeterminates where the first index distinguishes the indeterminates and the second index denotes the order of the corresponding derivative.

Example

The differential polynomial F:=u_1^2-u_2^3 in Q{x_1,x_2} with u_1=x_1^(4) and u_2=x_2^(4) where we consider only orders up to 20 is defined as follows:

 
 Use S::=QQ[x[1..2,0..20]];
 F:=x[1,4]^2-x[2,4]^3;
 

References

  • H. Bluhm: Gröbnerbasen in gewöhnlichen differentiellen Polynomringen, Doctoral Thesis, Dortmund, 2008