Nabla special functions footer

$\nabla$-special functions on time scales

$\nabla$-$\widehat{\cos}_p$	$\nabla$-$\widehat{\cosh}_p$	$\nabla$-$\widehat{e}_p$	$\nabla$-$h_k$	$\nabla$-$g_k$	$\nabla$-$\widehat{\sin}_p$	$\nabla$-$\widehat{\sinh}_p$