= Sergio Blanes
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Sergio Blanes coauthored methods for splitting differential-equation evolution with <Fernando Casas> and <Ander Murua>. They studied complex composition coefficients with positive real parts, avoiding the backward real-time steps required by higher-order real splittings. This matters for <parabolic partial differential equations>, where a backward diffusion substep can be ill posed.<Splitting methods with complex coefficients by Sergio Blanes and others>[Abstract and Section 1]{ref}
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