two weeks ago, i was in bergen, attending the international workshop on coding and cryptography (the last one was in paris, which i also attended). unfortunately, bergen presented itself from its well-known rainy side. when i arrived (by train from oslo), it was raining. most of the days it was raining, and if not, it was cloudy. the only two exceptions where wednesday afternoon, when the sun almost came out (one could see it through the clouds). on that afternoon, we had a boat tour scheduled. the boat went four three hours, and one could observe how beautiful everything would look like with sun:

like half an hour after arriving back in bergen, it continued to rain… on thursday evening, the conference dinner was planned. it was happening on the fløyen, where we drove up with the bløibanen. a usually beautiful place, but on that thursday, the sight was not so splendid, as the following panorama picture of bergen shows:

well, finally, on friday, the weather became really beautiful. while it didn’t stay dry during the whole day – there were some short showers now and then – it was sunny with a few clouds most of the day. and it was possible to run around with just a t-shirt and trousers. finally! :) i explored the city, the famous bryggen, the bergenhus fortress, went up the fløyen another time – again with the funicular –, walked down on foot, and enjoyed a nice evening before flying back on saturday. enjoy some of the photos i took on friday:

last week i was in leiden, attending a workshop on post-quantum crytpography and quantum algorithms at the lorentz center. it was a collection of talks and working in smaller groups, where we discussed certain topics, such as quantum attacks on ideal lattices in more detail, trying to find a way to use quantum computers to speed up attacks against primitives of post-quantum cryptography. as this is somewhat close to my research – i work on analyzing a quantum algorithm with pawel wocjan and am working on lattices and lattice reductions – i was very happy to attend this meeting. especially since there were not just some mathematicians, but also a lot of experts on various aspect of quantum computers and quantum algorithms. now i also know a lot more about quantum computing, both from the theoretical side – like having been explained grover’s algorithm, which is another of the fundamental quantum algorithms next to the period-finding algorithm family starting with shor’s algorithm – and the practical side – what the current technology with regard to building quantum computers is, and how people writing compilers for quantum computers can suffer and how complicated it can be to turn a “simple” algorithm into a circuit. i think this was one of the most productive workshops i’ve ever attended.
unfortunately, i neither took my camera with me (the little one i had with me last week, since it is somewhat broken (the sd card slot won’t keep the card anymore, similar to what is described here), nor did i really had time to take any pictures, as i spend most awake hours doing mathematics. i took a few shots with my mobile phone on the excursion/conference dinner on wednesday, which happend to be on a boat going through grachten around leiden and the city and also happened to be a very decicious and very spicy asian food buffet. and later, there was a great dessert buffet. one of the best and original conference dinners i had for quite some time :)

this week, i was attending a conference on monte verità in ticino.

ascona.

on tuesday we shifted the afternoon lectures by two hours to be able to exploit the great weather to visit ascona:

bellinzona.

on wednesday, we went on an excursion to bellinzona. unfortunately, the weather was not so great. we began with a tour through castelgrande and continued with a short city tour. here are some impressions:

last week, i was in castro urdiales, a small costal town in northern spain. there, two conferences were held, namely the third workshop on mathematical cryptology and the third international conference on symbolic computation and cryptography. i attended both conferences and stayed a little longer over the weekend. after the first impressions i’ve uploaded last weekend, after arriving in castro, i gathered some more photos during this weekend. these were all taken in the city boundaries of castro urdiales, most of them close to the coast. castro is a really beautiful place, mainly crowded by spanish and french tourists and people living there (well, and conference attendants). the weather is pretty neat, especially for someone who doesn’t like heat too much as i do. also, swimming in the atlantic ocean is just great. it’s definitely a nice place to visit!

monday and tuesday i was in basel, attending the speedup workshop, including a tutorial on intel threading building blocks and cilk plus. something i have to try out, by writing some lattice enumeration code with it, to see how it copes with it. especially the tutorial was definitely worth the time spend there.
but besides business, i walked around a bit in basel during monday’s lunch break, this time with my camera. this resulted in some nice photos, and some of these are here:

this week, i attended the seventh international workshop on coding and cryptography, held in paris at the institut henri poincaré. besides the three hour visit to paris in 2007, this was my first real visit to this city. the weather was nice, it was sunny though not too warm, and from times to times a bit cloudy (like on the free afternoon). i mainly roamed through the latin quarter up to the seine, the louvre being essentially the farest point away i’ve been at. i had my small camera with me on some of these trips, so here are some impressions.

i also went for a walk during night, once with a camera and once without.

out of the following three churches, namely the saint-étienne-du-mont, the notre dame de paris and the panthéon, i entered the panthéon and inspected notre dame in more detail. unfortuntely, i didn’t really find out when i could enter the saint-étienne-du-mont…

the following shots are from notre dame.

the last shots are from the panthéon and its crypt.

ps: if you want to eat at an excellent place in paris, try out the les papilles.

this weekend, i was in vancouver. a second time. this time, i attended the cms winter meeting. the computational number theory session was hosted in a hotel suite on the 29th floor, with a great view over the english bay. we also had a non-mathematician attending the session:

on my last day, i decided to go to stanley park another time. in fact, i walked once around it. here are some impressions from the walk and from the view we had during the session:

and sorry for the photo quality… i forgot to bring any camera, so i had to abuse my mobile phone…

last week, i was attending the ants ix, which was held in nancy this time (two years ago, it was in banff). this year i also presented a poster. here are some impressions from the city:

a very interesting thing are the trams in nancy. they use one rail instead of two, and work even without it. sounds better then it is, though, if you read this. (the tram in the direction of loria was broken, so we had to use a bus… the nice thing is, the busses in nancy have several screens to show information – but fail to show things like the route, the destination, the time, the next stops, or any other useful information. there is also nothing announced via speakers, so you really have to know where you are, where you are going, and constantly watch out to catch the names of the stops, and better know some of the stops before your stop…)

during end of may, i attended a conference held in the beautiful city of leuven, belgium. the conference was held at the arenberg castle, located in a beautiful park. here are some impressions:

the arenberg castle and its park.

leuven by night.

these photos are impressions from a city tour we had one night.

leuven by day.

here are some more impressions of leuven taken during the free afternoon.

last weekend, i was in banff. again. this time, i attended a weekend conference at the birs, the alberta number theory days. since it was just a short visit, there wasn’t much time to look around. nonetheless, here are some impressions from the banff centre and its surroundings. note that the lightening conditions weren’t very good as i took the photos in the evening.

the deer was grazing on the banff centre grounds; one sees “wild” animals roaming around there rather often. they tend to pretty much ignore humans, but you shouldn’t feed or touch them. one morning, i could see an elk walking around from my room’s window. i don’t have a photo of it, though.