mbol{h})}\)</span> for
<span class="math inline">\(\boldsymbol{h}=\|\boldsymbol{s}_i-\boldsymbol{s}_i\|\)</span>
for the Brown–Resnick model. In this setting, it is particularly easy
since the only requirement is non-negativity of the parameter. For
inference in dimension <span class="math inline">\(d&gt;2\)</span>, one
needs to impose the constraint <span class="math inline">\(\boldsymbol{\Lambda}=\{\lambda_{ij}^2\}_{i, j=1}^d
\in
\mathcal{D}\)</span> (cf. <span class="citation">Engelke et al.
(2015)</sp