ICS: A package for computing involutive characteristic set of algebraic partial differential equation systems. A constructive algorithm for the completion of arbitrary algebraic partial differential equation systems to involutive ones is presented. Based on it, an implementation ICS for computing the involutive characteristic set (ICS) of an algebraic partial differential equation system is given. Some examples are tested with ICS and some experimental results are obtained which may show a hint for computing the involutive characteristic set of arbitrary algebraic partial differential equation systems thereafter.

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