If z is a function from the real line R′ to a real Hilbert space X then the covariance function ϱ of z is defined by ϱ(t, s) ≡ (z(t), z(s)). It is proved that the function (z(·), y) is of bounded ...

Given a nonatomic scalar measure $\mu$, there is a vector valued, $\mu$-continuous measure of finite variation which has no derivative with respect to $\mu$, but which has the property that the ...

Objectives: To investigate the reliability of heart rate variability (HRV) measures at rest and during light exercise in children. Methods: Short term (five minute) HRV was assessed in 12 children (11 ...