Darij Grinberg

Assistant Professor
Drexel University

Karlsruhe (Germany) / Philadelphia, PA (USA)

Email address:
where the letter A should be replaced by darijgrinberg
and the sign = by the sign @.
(Apologies for this anti-spam obstruction.)
about | new | algebra | errata | teaching
qedmo | github | teaching archive
geo1 | geo2 | solutions | german

last update 4 Aug 2020
recent changes

This is a website for mathematics, elementary and advanced (mostly algebra and combinatorics).

About me and this website (this includes a FAQ, a CV, and instructions on opening the files on this site).


Abstract Algebra and Combinatorics (papers, preprints and notes)
(including notes on Hopf algebras in combinatorics (joint with Victor Reiner), notes on lambda-rings, and Hopfalgebren (lecture notes after Prof. Hans-Jürgen Schneider, in German), and various exposition and research).

Teaching archive (older classes)
(including homework sets, solutions and sometimes partial notes)

Errata and marginalia (to others' works)

German writings on Elementary Mathematics / Deutschsprachige Aufsätze über Elementarmathematik
(inkl. Arbeiten über Elementargeometrie und Lösungen von Wettbewerbsaufgaben)

Elementary Geometry: Publications and Unpublished notes

Solutions to review problems
(Some problems from American Mathematical Monthly and other sources, with my solutions.)

Other works

The notes below have been written for various purposes, and are sorted by expected usefulness (i.e., the first in the list are probably the most useful).

Texts written for internet forums:

- MO65420 (sourcecode). This shows some properties of alpha-equivalence and substitution in lambda-calculus that were required for MO question #65420. Already partly obsolete.