= Fernando Casas
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Fernando Casas studied <operator splitting> with <Sergio Blanes> and <Ander Murua>. Their work constructs higher-order compositions using complex coefficients with positive real parts. The approach addresses the negative-step obstruction of real-coefficient splittings, making high-order integration possible in settings where backward evolution, such as backward <diffusion>, is problematic.<Splitting methods with complex coefficients by Sergio Blanes and others>[Abstract and Section 1]{ref}
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