Coffee Meeting Log


Positive flat functions cannot be positive forever (via differentiations)

Hiroki Kodama (Visiting Scientist, iTHEMS / Assistant Professor, Advanced Institute for Materials Research (AIMR), Tohoku University)

We remark that there is no function on [0,1] which is flat at 0 such that the derivatives f^{(n)} of any order is positive on (0,1].


A new theorem on rational triangles

Ade Irma Suriajaya (Special Postdoctoral Researcher, iTHEMS)


On the unsolved mystery of biological clock

Gen Kurosawa (Research Scientist, iTHEMS / Research Scientist, Theoretical Biology Laboratory, RIKEN Cluster for Pioneering Research (CPR))

In 2017, the Nobel Prize in Physiology or Medicine was awarded to three scientists who studied the genetic mechanisms for our daily rhythm (so-called, biological clock). The rhythm is thought to govern the timing of sleep and, to possibly influence the efficacy of some important drugs. In this coffee meeting, I would roughly sketch out the unsolved mystery of biological clock which might be tackled by mathematical sciences.


IceCube experiment

Susumu Inoue (Research Scientist, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))


Quantum mechanics

Tetsuo Hatsuda (Program Director, iTHEMS)


Boolean networks and their biological, social, and mathematical problems

Fumito Mori (Theoretical Biology Laboratory, RIKEN)


A perspective on conformal field theory from Hyperbolic geometry

Tsukasa Tada (Coordinator, iTHEMS / Vice Chief Scientist, Quantum Hadron Physics Laboratory, RIKEN Nishina Center for Accelerator-Based Science (RNC))


About some misuses of statistics in science

Björn Ahlgren (KTH Royal Institute of Technology, Sweden)


Life and death of a neutron

Tetsuo Hatsuda (Program Director, iTHEMS)

1. What is neutron? 2. How it was born in the Universe. 3. How it survives in the Universe. 4. What is the fate of the neutron? 5. Open questions about the neutron.


Arithmetic of Words

Masato Taki (Senior Research Scientist, iTHEMS)

Word2Vec, proposed by googlers in 2013, is a nice numerical representation of a set of words. This vectorial representation realizes arithmetic relation between words. I will briefly explain how this representation is constructed, and demonstrate it by using a text of Plato.


Proposed iTHEMS project in virophysics: A web tool to count infectious virus! 

Catherine Beauchemin (Senior Visiting Scientist, iTHEMS / Professor, Department of Physics, Ryerson University, Canada)

I want to propose a fun, simple project for any iTHEMS members to join. The plan is to build a web-based calculation tool which can estimate the concentration of virus in a sample based on some standard measurements. 


Demonstration of VR system for RIKEN Open Day

Gilles Ferrand (Researcher, Astrophysical Big Bang Laboratory, RIKEN Cluster for Pioneering Research (CPR))

This will serve as a rehearsal for the ABBL booth at RIKEN Open Day. I may start with a short introduction on how it works, and our goals. Then iTHEMS people can try the experience with the guidance of ABBL members.