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For research I use the NIST Digital Library of Mathematical Functions (https://dlmf.nist.gov/) quite often for looking up basic facts about special functions. At the moment, however, this gives

Sorry, but due to fact that the federal government is currently shut down, the website dlmf.nist.gov will be unavailable until further notice.

Does anyone know if the DLMF has a mirror site?

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    $\begingroup$ Back in 2013, I commented in a referee's report of my similar experience, and suggested (somewhat bizarrely IMO) that the author(s) also cite the (non-digital) hard-copy "NIST Handbook of Mathematical Functions" from CUP. But web.archive.org is often your friend. E.g. web.archive.org/web/20180224092404/https://dlmf.nist.gov $\endgroup$ Commented Jan 23, 2019 at 5:30
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    $\begingroup$ this must be one of the most unexpected consequences of The Shutdown ;) $\endgroup$ Commented Jan 23, 2019 at 7:18
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    $\begingroup$ Looks like you'll need to locate a physical copy closest to you: worldcat.org/title/nist-handbook-of-mathematical-functions/oclc/… $\endgroup$ Commented Jan 23, 2019 at 8:28
  • $\begingroup$ In the meantime, a useful alternative is the database on special functions maintained by Wolfram: functions.wolfram.com $\endgroup$ Commented Jan 23, 2019 at 8:30
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    $\begingroup$ To put posterity's mind at ease, the DLMF site is currently back up. $\endgroup$ Commented Jan 29, 2019 at 9:17

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