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

Description

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

• UnstableGrothendieckWittClass -- a new type intended to capture an element of the unstable Grothendieck-Witt group of a field or finite étale algebras over a field
• getAlgebra -- returns the algebra over which a stable or unstable Grothendieck-Witt class is defined
• getBaseField -- returns the base field of a stable or unstable Grothendieck-Witt class
• getMatrix -- returns the Gram matrix of a stable or unstable Grothendieck-Witt class
• makeGWuClass -- constructor for unstable Grothendieck-Witt classes