# Robert P. Langlands

## Introduction

Author's comments: Problems of endoscopy first arose as I began the study of Shimura varieties in Bonn during the academic year 1970/71. I reflected on them for a long time, in part in collaboration with Labesse, in part in collaboration with Shelstad. I presented a fairly mature form of my reflections in the Paris lectures, Les débuts d'une formule des traces stable, in which the presence of a major obstacle, overcome considerably later through the efforts of a number of mathematicians, in particular Waldspurger and Ngô, was clearly described.

School of Mathematics:

## An Appreciation

Author:
Robert Langlands
Type:
article

Author's comments. Although these notes were written as a foreword to, or an appreciation of, a book by Qing Zou that is to appear soon, the primary purpose for me was to describe some possibilities in the theory of automorphic representations upon which I believe it is important for specialists to reflect. I was grateful to Qing Zou for the somewhat unexpected request to write an appreciation. The book itself will appear in Chinese; the translated title is From Kummer to Langlands—The history of the Langlands Program''

Publication Type:
Publications
School of Mathematics:

## Mathematical retrospections

Author:
Robert P. Langlands
Last Name:
Langlands
Type:
article
Keywords:
Miscellaneous
School of Mathematics:

## Istanbul konferans dizisi

Author:
Robert P. Langlands
Type:
article
Keywords:
informal

Author's comments: These notes are a very first draft of the very first part of a continuing series of lectures that will be held at the Yildiz Teknik Universitesi in Istanbul and may ultimately become an informal essay on various simple aspects of mathematical history and related matters. As they now stand, they are no more than a tentative beginning both linguistically and conceptually. They are posted primarily for use by the audience at the lectures. I apologize in advance for all their failings, grammatical and mathematical.

School of Mathematics:

## Interview with Farzin Barekat for the University of British Columbia

Author:
Robert P. Langlands
Type:
article
Keywords:
Miscellaneous

Authors's comments: These are my responses to questions of Farzin Barekat, a graduate student at the University of British Columbia, where I was an undergraduate student for four years and a graduate student for one year. The questions and my responses were transmitted electronically. An abbreviated version of my responses will be published in a newsletter of the mathematics department of the university.

School of Mathematics:

## Pour la science

Author:
Robert P. Langlands
Journal
Journal:

Une façon de faire la théorie des nombres

Year:
2007
Type:
article
Keywords:
Miscellaneous

Author's comments: The following article appeared in novembre, 2007 in the popular scientific review, Pour la Science, but in a version slightly revised by the editors and their consultants for expository purposes and with diagrams added. I am sure the revised form is indeed easier for a layman to understand, but some assessments were added that are not mine. Rather than interfere with the editors' difficult task of turning arcane material into something meaningful to their readers, I let the revised version stand.

School of Mathematics: