Homepage of Jaap Spies

Some Information

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Some information, if you really want to know: Personal


Retired Mathematics Teacher/College Lecturer and Computer Scientist.

My Permanent Formula

An overwiew of my algorithm from 2003 until now.

In the NAW 5/21 nr. 1 march 2020 there is an article "A formula for the permanent".


Sailing in a Dutch Traditional 'Vollenhovense Bol 8.50 m' Bollejan. Image of a Happy Sailor

Unix/Linux. Open Source. Raspberry Pi.

Programming in Python and Sage.

Sage is a free open-source mathematics software system.

Solving Mathematical Problems

OEIS, The On-Line Encyclopedia of Integer Sequences.
Search for Jaap Spies


Publishing Books, New!

Many more

Some links

Sage Days 6 in Bristol.
See my pictures Day 1, Day 2, Day 3, Day 4, Day 5, Day 6 (extra)

Sailing at the 5ECM.

Sage Days 10 in Nancy. Some photos.

Sage Days 23 in Leiden. Official website Lorentz Center.

Spies Sage Development Prize

See my bookmarks

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