# ApCoCoA-1:Weyl.IsHolonomic

From ApCoCoAWiki

## Weyl.IsHolonomic

Checks whether an ideal in Weyl algebra An is Holonomic or not.

### Syntax

Weyl.IsHolonomic(I:IDEAL):BOOL

### Description

**Please note:** The function(s) explained on this page is/are using the **ApCoCoAServer**. You will have to start the ApCoCoAServer in order to use

it/them.

An ideal I is holonomic if it has dimension n, the number of variables in the Weyl algebra

This function determines whether an ideal I is holonomic by checking its dimension.

#### Example

W3::=ZZ/(7)[x[1..3],d[1..3]]; Use W3; Cpu time = 0.00, User time = 0 ------------------------------- F1:=-d[1]^3d[2]^5d[3]^5+x[2]^5; F2:=-3x[2]d[2]^5d[3]^5+x[2]d[1]^3; F3:=-2d[1]^4d[2]^5-x[1]d[2]^7+x[3]^3d[3]^5; I:=Ideal(F1,F2,F3); Weyl.IsHolonomic(I); -- CoCoAServer: computing Cpu Time = 2.36 ------------------------------- FALSE -------------------------------

#### Example

A2::=QQ[x[1..2],d[1..2]]; Use A2; ------------------------------- I:=Ideal(x[1]d[1] + 2x[2]d[2] - 5, d[1]^2 - d[2]); ------------------------------- Weyl.IsHolonomic(I); -- CoCoAServer: computing Cpu Time = 0 ------------------------------- TRUE -------------------------------

### See also