Presentations -

Amalgams, SL(2, Z) and Cryptography

Akihiro Yamamura

International Conference on Algorithmic Problems in Groups and Semigroups,  (Lincoln, U.S.A.)  1998.05  -  1998.05 

Public-key cryptosystems using the modular group

Akihiro Yamamura

International Workshop on Practice and Theory in Public Key Cryptography  (横浜)  1998.02  -  1998.02 

HNN extensions of semilattices

Akihiro Yamamura

AMS section meeting  (Milwaukee, U.S.A.)  1997.10  -  1997.10  American Mathematical Society

HNN extensions of semilattices and the Nielsen-Schreier theorem

Akihiro Yamamura

International Congress in Algebras and Combinatorics  (Hong Kong)  1997.08  -  1997.08 

Universal unitary covers of inverse semigroups

Akihiro Yamamura

Semigroups and Applications  (St.Andrews, U.K.)  1997.07  -  1997.07 

Graphs of inverse monoids

Akihiro Yamamura

International Conference on Algebraic Engineering and Semigroups  (会津)  1997.03  -  1997.03 

HNN extensions of inverse semigroups and applications

Akihiro Yamamura

International Conference on Modern Algebra and its Applications  (Nashville, U.S.A.)  1996.05  -  1996.05 

HNN extensions of inverse semigroups

Akihiro Yamamura

AMS national meeting  (Orlando, U.S.A.)  1996.01  -  1996.01  American Mathematical Society