man-roxygen/deriv_wv/2nd/deriv2_wn.R

In SMAC-Group/gmwm: Generalized Method of Wavelet Moments

#' @section Process Haar WV Second Derivative:
#' Taking the derivative with respect to \eqn{\sigma^2}{sigma^2} yields:
#' \deqn{\frac{{{\partial ^2}}}{{\partial {\sigma ^4}}}\nu _j^2\left( \sigma ^2  \right) = 0 }{d^2/dsigma^4 nu[j]^2(sigma^2) = 0}