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D.15.11.34 isPositive
Procedure from library multigrading.lib (see multigrading_lib).
- Usage:
- isPositive()
- Purpose:
- Computes whether the multigrading of the ring is positive.
For computation theorem 8.6 of the Miller/Sturmfels book is used.
- Returns:
- true if the multigrading is positive
Example:
| LIB "multigrading.lib";
printlevel = 3;
ring r = 0,(x,y),dp;
intmat A[1][2]=-1,1;
setBaseMultigrading(A);
isPositive();
==> 0
intmat B[1][2]=1,1;
setBaseMultigrading(B);
isPositive(B);
==> 1
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