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428,362 sets of equations
I calculated that there are 428,362 sets of equations for the the Irregular Chocolate Bar problem for the problem of finding 22 unique
integers which can be divided in up to and including 10 partitions. (This
calculation took 13 hours 39 minutes.) So far, my program has searched 62,378
of these sets of equations and found 959 solution with some duplicates
resulting in 554 unique solutions. It looks like the program will require some
more months to search the remaining sets of equations.
Three Dune Books
At 09:49, I bought the following three book from charity shop Het Goed, for € 0.95 each, all written in English
and published by New English Library:
- Dune Messiah written by Frank Herbert, published in 1977,
- Children of Dune written by Frank Herbert, published in 1977.
- God Emperor of Dune written by Frank Herbert, published in 1981,
I have now all books of the Dune series written by Frank Herbert both in English as in Dutch. I have not read all of them in
This afternoon, I bought a print of the woodcut 'Droomkoppel' from Willemijn Calis, which I saw on April 14
at the exhibition 'China Dreams'.
At 9:52, I bought the following two books from charity shop Het Goed:
At 17:10, I bought the following seven comics (all in Dutch) from
Valérian and Laureline series, drawn by
Jean-Claude Mézières after a scenario by
and published by Dargaud:
- The Awakening and Selected Short Fiction by
Kate Chopin, Rachel
Adams, and George Stade (also editor) in English and published by Barnes
& Noble in 2005,
ISBN:9781593081133for € 1.50.
- The Awakening - Thrift Study Edition written by Kate Chopin in
English and published by Courier Corporation in 2010,
ISBN:9780486475660, for € 0.95.
- Ravian: Het woedende water translated from La Cité des
eaux mouvantes, ISBN:9032003217, for € 2.50.
- Ravian: Land zonder sterren translated from Le Pays sans
étoile, for € 1.95.
- Ravian: Het verloren volk translated from Bienvenue sur
Alflolol, ISBN:9032003217, for € 1.95.
- Ravian: De ambassadeur de schaduwen translated from L'Ambassadeur
des Ombres, ISBN:9032002368, for € 1.95.
- Ravian: De vale schepper translated from L'Sur les terres
truquées, ISBN:9032002376, for € 2.50.
- Ravian: Brooklyn station eindpunt cosmos translated from Brooklyn
station terminus cosmos, for € 1.95.
- Ravian: De levende wapens translated from L'Sur les terres
truquées, ISBN:9067933147, for € 1.95.
Daries of Doeschka Meijsing
I finished reading the book En liefde in mindere
mate: dagboeken 1961-1987 about the diaries of Doeschka Meijsing, a Dutch novelist. This is part one, as she died in
2012. It seems that the second part has not been published yet. Almost half of
the book consists of notes. Some of the notes, contain back ground information
that is not really relevant for understanding the diary. The editors of the
diaries, made a selection of her diary. They did not give information about
the ratio of entries they selected. I felt they might have better included more
entries and make the notes more concise. It was an interested read. It does
show, as so many biographies before, that people wrestle for many years with
problems in their lives and have a very hard time to change there basic habits.
Three fold rotation symmetry
I thought about a way to visualize the long
sequence of coloured rubber straps, and I came up with the following
In this figure there are ten triangles, one for each combination of the five
coloured rubber strapts, such that the vertices are on a circle representing
the repeated sequence. There are fifteen pairs of parallel lines, where each
pair represent two combination occuring in both directions along the sequence.
At first sight the figure seems to have some mirror symmetries, but actual it
has a three fold rotation symmetry.
This months interesting links
| April 2018