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Magma is closed-source.

See Slide 4 for why it's important to be open source.

TL;DR: Researcher A finds things he wants improved in Magma (closed source) but can't. Researcher B tries to write improved FOSS implementation, but lost his job, likely in part by spending too much time writing said code and not doing other things like writing papers. Researcher A moves on and has a successful academic career. Moral: writing FOSS can cost you your academic job; it's safer to find something else to do.

Right - would you rather rely on a theorem which the author claimed is true, but won't let you see the proof, or one where the proof is published and reviewed? That's the choice between closed and open source math software.

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