description:
f=BMVq(m,k) constructs the (m,k) BMV polynomial with x^2 and y^2 as arguments (for modelling psd matrices).
arguments:
m and k are non-negative integers
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output:
f is the corresponding BMV polynomial
possible usage:
BMVq(m,k)
example:
>> f=BMVq(5,4)
f = x^2*y^8+y^2*x^2*y^6+y^4*x^2*y^4+y^6*x^2*y^2+y^8*x^2