Math Open Reference
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We have used advertising to support the site so it can remain free for everyone. However, advertising revenue is falling and I have always hated the ads. So, would you go to Patreon and become a patron of the site? When we reach the goal I will remove all advertising from the site.
Become a patron of the site at patreon.com/mathopenref
While you are here..
Math Open Reference has always been free and open to all. You can keep it that way -
Become a patron of the site at patreon.com/mathopenref