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It is a violation of this policy to submit a problem solution that you are unable to explain orally to a member of the course staff.
Anyone can submit a problem they want solved, and the best ones will get voted up.
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Knowing whether one is right or wrong right after submitting a problem supports more productive learning and better internalization of the lecture material.
It all started when we submitted a problem statement at the London leg of the Sanitation Hackathon, an event that took place simultaneously in 14 cities around the world in early December 2012.
Submitting a problem is straightforward.
Guo et al. (2014) provided a retrospective study that used edX trace data, interviews with edX staff, page navigation, video interactions and submitting a problem for grading as sources of data.
As well as its proprietary expertrank algorithm, the other piece of key tech is the platform's real-time marketplace management of its experts — so every time a user submits a problem it goes through a real-time global auction (taking about 30 seconds, according to Relan) to match them with a relevant expert who can answer their problem.
Were one of my students to submit a mathematics problem set that was obviously copied, I would not accept the excuse that it was prepared by an anonymous writer hired for that purpose.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com