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[DON’t MERGE YET] Xbraid extension #471
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…y the p-multigrid solver
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@mmoelle1 keep this, examples PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this, benchmark PR
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@mmoelle1 keep this. Separate PR
XBraid extension added
This extension implements a multigrid-reduction-in-time (MGRIT) algorithm for solving transient problems efficiently. It provides a G+Smo wrapper for XBraid (https://github.com/XBraid/xbraid) and an example application for the heat equation.