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getScalar -- returns the non-zero scalar of an unstable Grothendieck-Witt class

Description

Given an UnstableGrothendieckWittClass object beta, this method returns the non-zero scalar of the unstable Grothendieck-Witt class. This scalar is an element of the base field or finite étale algebra of the unstable Grothendieck-Witt class.

i1 : M = matrix(QQ, {{0,1},{1,0}})

o1 = | 0 1 |
     | 1 0 |

              2       2
o1 : Matrix QQ  <-- QQ
 
i2 : getScalar makeGWuClass(M, -4)

o2 = -4

o2 : QQ

See also

Ways to use getScalar:

  • getScalar(UnstableGrothendieckWittClass)

For the programmer

The object getScalar is a method function.

The source of this document is in A1BrouwerDegrees/Documentation/UnstableGrothendieckWittClassesDoc.m2:250:0.