On the deficiency indices and self-adjointness of symmetric Hamiltonian systems

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On Weyl-Titchmarsh theory for singular finite difference Hamiltonian systems (2003, background): “10.7], [50]–[59], [64]–[ 67 ], [70], [74]–[77], [79, Ch. 9], [83, ] and the references therein); the corresponding theory for Jacobi operators can be found in [9, Sect.”
Boundary relations and their Weyl families (2006, background): “However, if H ( t ) is singular on a subset of positive Lebesgue measure of (0 , ∞ ), then (1.8) generates a closed symmetric relation S , whose domain is not dense in L 2 H (0 , ∞ ) and which need not even be a graph of an operator; cf. [31], [27].”
Boundary Value Problems, Weyl Functions, and Differential Operators (2020, background): “In [97] it is indicated how all such systems fit in the boundary triplet scheme; see also [471, 538].”
Square‐integrable solutions and Weyl functions for singular canonical systems (2011, background): “This approach to canonical systems via linear relations goes back to [63], see also [42], [43] and [32], [52], [76].”