TY - RPRT TI - Optimal Transfer Operators in Algebraic Two-Level Methods for Nonsymmetric and Indefinite Problems AU - Krzysik, Oliver Andrew [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000178806512) AU - Southworth, Benjamin Scott [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000202834928) AU - Wimmer, Golo Albert [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000278711748) AU - Ali, Ahsan [Baylor Univ., Waco, TX (United States)] (ORCID:0009000291695129) AU - Brannick, James [Pennsylvania State Univ., University Park, PA (United States)] (ORCID:0000000316370439) AU - Kahl, Karsten [Bergische Univ. (Germany)] (ORCID:0000000235103320) PY - 2026 DO - 10.1137/25m179436x UR - https://www.osti.gov/biblio/3382488 ID - 3382488 ER -