Dr Alexander H. Frey, Jr., received his PhD in Mathematics in 1960. He worked for over thirty years for IBM, and then for fifteen years on distributed file system technology. Now retired, he pursues his interest in the mathematical properties of many puzzles, including Sudoku and four and five dimensional Rubik’s cubes.
Showing the single result
Showing the single result
Many of our books are available in eBook format. Click here for eBook titles currently available on our website.
| Cookie | Duration | Description |
|---|---|---|
| _ga | 2 years | Set by Google Analytics to distinguish users and to record the time of their first visit to the website; expires 2 years after it was last set or updated, and is updated every time data is sent to Google. |
| _gat | 1 minute | Set by Google Analytics to throttle the rate at which requests are sent to the Google servers; expires after 1 minute. |
| _gid | 1 day | Set by Google Analytics to distinguish users; expires 1 day after it was last set or updated, and is updated every time data is sent to Google. |
