Last update: May 20, 2025
About the web site Differential Geometry
Differential Geometry, operated by freelance mathematician Andrew D. Hwang (“I”), is an online shop that sells original mathematical jewelry and sculpture, original mathematical designs printed on wall art, clothing, and other items. The site also hosts a math blog whose aim is to promote understanding and appreciation of mathematics and mathematical beauty.
Below, the terms “we” and “our” refer to the company, Differential Geometry LLC, that I own and operate. “Differential Geometry” and “our site” refer to this web site.
Terms of Site Use
Differential Geometry offers products and services (such as product images and blog posts) in good faith. In lieu of lengthy legalese, this page qualitatively summarizes our terms. If you do not agree to these terms, do not use the Differential Geometry site. Use of the site (for example, to make a purchase, or to post a comment) constitutes acceptance of these terms.
We reserve the right to correct errors, and offer no warranties regarding correctness of information. (For example, we cannot guarantee that the color of an item exactly matches its color on your monitor. We cannot guarantee that mathematical posts are free from errors.)
Our products and services may change, cease, or be interrupted without notice.
Comments on blog posts are moderated. We reserve the right not to approve comments, and we accept no liability for declining to approve a comment. Approved comments are publicly visible, and do not earn compensation.
Our services may involve links over which we have no control. We do not assume liability for these materials. (For example, we make a good faith effort to investigate links in comments submitted for posting, but we do not assume liability for the content of linked sites.)
Do not do anything illegal with our products, our online store, or our platform. Do not attempt to break into (“hack”) the site.
We reserve the right to refuse service (for example, to entities that attempt to post spam), at our sole discretion.
Our Privacy Policy details information we collect and purposes for which we use it.