To begin
This third special issue of 2020, which appears on schedule despite the tragic events of the year, is dedicated to Operations Research. The Tangente team thanks the two learned societies, ROADEF and GDR RO, which were deeply involved in its writing. Thanks to the members of the Scientific Committee, and in particular to Nadia Brauner, who devoted a lot of time to the success of this issue.
All articles in this folder

Operational research in France: a history | Tangente
Operational research (OR) seems to have emerged in the US military, first in radar development and then in inventory management during the First World War.

ROADEF, a learned society for operational research | Tangente
Since its founding in 1998, ROADEF has played an important role in operational research in France.

CNRS operational research group | Tangente
In France, research laboratories are often large—sometimes employing several hundred researchers—and span several disciplines. GDRs coordinate research in a particular discipline across laboratories, allowing researchers to exchange ideas directly with other specialists in their field, all of whom are brought together within the GDR.

ROADEF/EURO challenge: 20 years of OR competitions | Tangente
This challenge is an exemplary model of collaboration between industry and academia in solving operations research problems!

Great names in operations research: Edmonds and Dantzig | Tangente
A few portraits of mathematicians whose work had a major impact on operational research

RO in quarantine: optimizing lockdown life | Tangente
Confined to our homes because of Covid-19, we all suffered from having to restrict our living space, share the household computer, continue our schooling in chaotic conditions and help with chores we had previously managed to avoid.

Editorial
The scientific committee that coordinated this issue consists of Christian Artigues, Nadia Brauner Vettier, François Clautiaux and Pierre Fouilhoux.
