TY - JOUR ID - Cho2021 LB - Cho2021 AU - Cho, Minsung AU - Hoisington, Seth AU - Nichols, Roger AU - Udall, Brian TI - The Krein-von Neumann extension of a regular even order quasi-differential operator ST - The Krein-von Neumann extension of a regular even order quasi-differential operator JO - Opuscula Math. JA - Opuscula Math. JF - Opuscula Mathematica PY - 2021 VL - 41 IS - 6 SP - 805 EP - 841 DO - https://doi.org/10.7494/OpMath.2021.41.6.805 UR - https://doi.org/10.7494/OpMath.2021.41.6.805 AB - We characterize by boundary conditions the Krein-von Neumann extension of a strictly positive minimal operator corresponding to a regular even order quasi-differential expression of Shin-Zettl type. The characterization is stated in terms of a specially chosen basis for the kernel of the maximal operator and employs a description of the Friedrichs extension due to Möller and Zettl. KW - Krein-von Neumann extension KW - regular quasi-differential operator SN - 1232-9274 ER -