Clay Mathematics Institute

Dedicated to increasing and disseminating mathematical knowledge

Cookies and Privacy

Privacy Statement

CMI does not pass on or collect personal information about visitors to this website.

Cookies Set by this Website

Drupal (has_js): This cookie records whether or not the user has javascript enabled.
Drupal (SESS...):  Temporary session cookie. This cookie is deleted as soon as you close your browser.
Mathjax (_cfuid):  The site uses MathJax on some pages.  MathJax is a JavaScript engine that displays mathematical notation in web browsers. When you view one of these pages the MathJax website will place a cookie

domain =, name = __cfduid

on your computer. It is used to identify individual clients behind a shared IP address and to apply security settings on a per-client basis.  It does not store any personally identifiable information.

Google Analytics (_ga etc):  These cookies are created for use with Google Analytics. 

_ga is used to distinguish users and has an expiration of 2-years.
_gid is used to distinguish users and has an expiration of 24-hours.
_gat is used to throttle requests and has an expiration of 10-minutes.

In each case, the value format is: 



Version = GA version
Depth = 2 for Top Level Domain, 3+ for Subs, etc
UniqueID = Random Number
CreationTimeStamp = Epoch Time When Cookie Was Created

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