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Book
At 10:57, I bought the book Najaarstentoonstelling 1999: 19e eeuw
written and published by Simonis &
Buunk Kunsthandel, ISBN:9080072605, from thrift store Het Goed for € 1.25.
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IJduino animation
I created an animation for the
IJduino based on the
patterns used in Komputerstrukturen
2 and 2a by Peter Struycken. To the right, a reproduction of the animation using
JavaScript. The pattern changes every second,
except if the change would introduce four dots to come together to form a
square. It looks like there are some complex rules behind the movements of
the dots, but in fact every dot moves around in its own two by two square.
There are 16 dots moving around in four by four such squares.
Antwerp trip
This weekend we went to Antwerp with the company and stayed there for one
night, because the company exists for 15 year. Yesterday, I visited all kinds
of bookships. Today, I also walked around a little. (Here the GPS tracks and
the route I walked in Google Earth or in
Google Maps). The bookshops I visited are:
- Bookshop De Markies.
I bought the book the samurai tree invariants from Gabriel Orozco,
ISBN:9873865691667, for € 22.00.
- Copyright
- Fnac. Not really a bookshop.
- Standaard Boekhandel Huidevettersstraat. I bought the book
Consciousness and the Brain by
Stanislas Dehaene, ISBN:9780143126263, for € 18.95.
- Standaard Student Shop Campus Antwerpen. For highschool.
- De Slegte. I only visited the second hand part of the shop. Only later
I discovered that there was a second shop just beside it with cheaply
priced books.
- 't Verschil.
- De Groene Waterman.
- Anti-quariaat at Wolstraat 2. I had a short conversation with the owner
and a visiting author.
This morning, I went back to bookshop De Markies, because after I opened
the book that I bought there, I realized that it might have been part of a
set of books, because it only contained images and no text. I remembered that
there was another book close to it with no price tag. That was indeed correct,
and I was given Gabriel Orozco. The Samurai's Tree Variants,
ISBN:9783865601803.
Steve Jobs
Today, I finished reading the Dutch translation of Steve Jobs the authorized biography of Steve Jobs written by
Walter Isaacson, which I started reading on March 20, the day after which
I bought it. My primary motivation to read this
book was to evaluate The Bite in the Apple
by Chrisann Brennan. I have come to the conclusion that that book does indeed
not give a very different view of Jobs than I had thought at first. The
Japanese Zen priest Kobun is but mentioned as a side note in the authorized biography, while
Brennan describes him as a key figure in the life of Jobs. While reading the
biography, I often felt that my achievements fall very short of those of Jobs,
but on the other hand, I am also happy I do not share his character and
ambitions. I am much more like Steve Wozniak.
'Volume' of planar graph
Given the followoing four collections of points:
PA = { (2i, 2j, 2k) | i,j,k ∈ ℕ }
PB = { (2i+1, 2j+1, 2k) | i,j,k ∈ ℕ }
PC = { (2i, 2j+1, 2k+1) | i,j,k ∈ ℕ }
PD = { (2i+1, 2j, 2k+1) | i,j,k ∈ ℕ }
And a given triangular planar graph (where each face is a triangle), the
vertices can be mappeld on the union of these collection, such that each edge
connects two points (from different collections) such that the distance
between the points is equal to the root of 2.
The implication is that each triangle face of the graph is mapped to
equilateral triangle. It is relatively easy to calculate the volume of the
resulting triangular mesh. For each triangular planar graph there is one (or more)
mapping with a maximum volume. We could call this the 'volume' of a planar
graph.
The proof that a mapping exists is as follows. For each triangular planar
graph there exists a four colouring of the vertices
with the colors A, B, C, and D. It is clear that one could assign each of the
vertices with to the 'zero'-element of the collection matching the colour,
where the 'zero'-element is the element with i, j, and k being zero.
The edges can be labelled with α, β and γ depending on the
colours of the edges they connect, such that edges between A and B and edges
between C and D are labelled with α, that edges between A and C and edges
between B and D are labelled with β, and that edges between A and D and
edges between B and D are labelled with γ. In this case each triangle
face will be labelled with α, β and γ exactly once.
The Kempe chains
αγ, αβ, and βγ in the dual graph partition
the vertices for each type of Kempe chain. These partions can be assigned a
natural number such that adjecent partitions differ exactly one. These numbers
match with the three coordinates of the points. The case where the numbers are
restricted to 0 and 1 is equavalent with the mapping to the zero-elements. But
other mappings are possible resulting in a greater volume.
Books and AKI finals 2015
At 11:45:33, I bought the following two books from bookshop Broekhuis:
- Both Flesh
and Not, a collection of essays by David Foster Wallace,
ISBN:9780241146095, for € 5.95.
- De Nederlandse erotische literatuur in 80 en enige verhalen
selected and collected by Elsbeth Etty, ISBN:9780241146095, for
€ 5.00.
In the afternoon, Conny and I visited the
'Finals AKI 2015' exhibition. We went to
TETEM art space and next to the
AKI ArtEZ building. Finally, we also went to
the city center to have a look at Concordia art exhibition center, where a
selection of the 'best' works were on display. I found the following artists
interesting:
At 15:07, I bought Reproductie / Reproduction / Reproduktion,
ISBN:9789075522365, the exhibition catalogue for € 15.00.
This months interesting links
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