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David Ketcheson
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An applied mathematician in Saudi Arabia
An applied mathematician in Saudi Arabia

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"Every great open source math library is built on the ashes of someone’s academic career.”
"10 years of SageMath; why I'm leaving academia" - http://buff.ly/1PRcfvJ @ BP Centenial conference, Harvard today. http://buff.ly/1PRcRSh

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I find it disturbing that our society is irrational enough to accept the tradeoffs described so clearly in this article.
"But that’s not how political and bureaucratic logic works. If the TSA loosens up its screening procedures to the point where almost everything gets through, the lines move -- but then there’s not really any point in having the TSA."

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The University of Montreal has just announced that it has had enough of Springer's pricing policy -- which is the usual one of offering a huge and very expensive bundle of journals, most of which are hardly read. Instead, they will subscribe to a much smaller collection, which nevertheless covers a significant percentage of downloads, and use interlibrary loans to give their researchers access to the rest. It will be interesting to see whether SciHub usage increases ...

If you are not already making your articles freely available online, maybe you should start now, to support universities that have decided that enough is enough, and to make it easier for other universities to follow their example. And if your university is about to sign up to another Big Deal, maybe you should draw its attention to the fact that some universities have cancelled their subscriptions without the world coming to an end.

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The international survey of opinion on mathematical journal reform has 432 responses so far. Please join in if you are in the target group: reader, author, reviewer or editor for a mathematical sciences journal in the last 3 years.


https://docs.google.com/forms/d/1r4LBUJk1VF9e4Dl4aXgS4fW-O8HR9yz1cqmXdzz0CjM/edit

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This page is supposed to let you get a DOI for a Github repo. I used it once several months ago, but now when you fill the form and submit, it just gives a 404 error. Anybody know what happened or how to do this now?

The page linked to is run by Mozilla.

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The comments on this question (and on its answer) are a fascinating look at how scientists from one field can be eager to (mis)judge the social norms in another.

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I have only one word for this mathoverflow question and its 13 upvotes: Wow.

If you're not familiar, 13 upvotes is a huge number for MO.

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As a rule, I don't discuss politics on the internet.  But this has hurt too many of the people I love.  

The linked article is an editorial by Desmond Tutu.

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An illustrated guide to limiters
Or: how to interpolate non-smooth data without creating wiggles

This is a Jupyter Notebook that explains slope limiters, including TVD limiters and WENO, with code and interactive examples.  At the very bottom is an animation showing how several different methods behave for advection of a Gaussian and a square wave.

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An illustrated guide to limiters
Or: how to interpolate non-smooth data without creating wiggles

This is a Jupyter Notebook that explains slope limiters, including TVD limiters and WENO, with code and interactive examples.  At the very bottom is an animation showing how several different methods behave for advection of a Gaussian and a square wave.
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