User blog comment:Deedlit11/So what the hell is a diagonalizer?/@comment-28606698-20161022191844

Applying to the FGH, is it correctly to write, for example $$f_{\psi_\Omega(\chi(\text {M} \uparrow \uparrow a)(0))}(n)$$ $$f_{\psi_\Omega(\chi(\varepsilon_{\text {M+1}})(0))}(n)$$ (where $$\psi$$ - Rathjen's function; a,n - positive integers)