Description Usage Arguments Details Value See also Examples
curv_meas_exact
returns the exact values of the curvature measures of
symmetric cones, which are known (n==1,2,3
).
1 | curv_meas_exact(beta, n)
|
beta |
Dyson index specifying the underlying (skew-) field:
|
n |
size of matrix. |
The known curvature measures are elements in the ring Q[sqrt(2),1/pi]
,
so the exact values can be given in terms of integers corresponding to a
common denominator and corresponding integer matrices for the coefficients
of the natural expansion in 1, sqrt(2), 1/pi, sqrt(2)/pi
. These matrices
are returned by this function, along with the denominator and the combined
matrix of curvature measures.
The output of curv_meas_exact
is a list of six elements:
A
: the combined matrix of curvature measures; A
is given in terms of the other parameters by
(A_const + A_sqrt2*sqrt(2) + A_piinv/pi + A_sqrt2_pi*sqrt(2)/pi)/denom
A_const
: integer matrix for the constant term
A_sqrt2
: integer matrix for the sqrt(2)
term
A_piinv
: integer matrix for the 1/pi
term
A_sqrt2_pi
: integer matrix for the sqrt(2)/pi
term
denom
: common denominator of all terms
alg_deg
Package: symconivol
1 2 3 4 5 6 7 8 9 10 11 | # considering the case of 3x3 complex unitary matrices
CM <- curv_meas_exact(2,3)
# sum of intrinsic volumes is equal to one
sum( CM$A )
# sum of even (and odd) index intrinsic volumes is 1/2
sum( CM$A %*% rep_len(c(1,0),dim(CM$A)[2]) )
# A is given by combining the remaining matrices and the denominator
norm( CM$A - ( CM$A_const + CM$A_sqrt2*sqrt(2) + CM$A_piinv/pi + CM$A_sqrt2_pi*sqrt(2)/pi )/CM$denom )
|
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