up previous next
MultiArrExponents    --    exponents of a free multiarrangement of hyperplanes


Syntax 
MultiArrExponents(MultiA: LIST): LIST

Description
This function returns the list of exponents of a free multiarrangement of hyperplanes MultiA.

Example 
/**/ use QQ[x,y];	
/**/ MultiA := [[x,1], [x-y,3], [y,2]]; -- free
/**/ MultiArrExponents(MultiA);
[3,  3]

/**/ use QQ[x,y,z];
/**/ MultiA := [[x,1], [x-y,3], [z,2], [x+y-z,3]]; -- not free
/**/ IsMultiArrFree(MultiA); --> false
-- /**/ MultiArrExponents(MultiA);  --> !!! ERROR !!! as expected, not free

See Also