QED - an interactive textbook

Note: this version of the text is no longer actively maintained. The most current version of this text can be found here.
Sections and exercises

The current version is 2.0.1.

If the text has updated to a new version since your last session, you may need to reset the text in order for it to work correctly, or at least redo some of the exercises that unlock certain laws. This page works best when viewed on a large screen and with the ability to drag-and-drop; in particular, this page is unlikely to be all that functional on a cell phone. Also one may need a recently updated browser in order for the page to work properly (in particular, grid layouts and local storage should be supported for the best experience).

Further discussion this text may be found at this blog post.

Transferring progress to the new page

To import your progress from this page to the new page, perform the following instructions.
  1. On this web page, click on the "EDIT STATE" button. An "Enter new state here" window will appear at the very bottom of the page. Copy the text from that window to the popup to the clipboard. Click "cancel" to remove the window.
  2. Visit the new page and click the "EDIT STATE" button there. Paste the clipboard into the "Enter new state" window at the bottom of the page and then click "OK".