calkin

n.

蹄铁上的防滑尖铁，蹄铁的折曲端，鞋底铁掌；

The Calkin algebra has outer automorphisms
Calkin algebras and algebras of operators on Banach spaces
Calkin Algebras and Algebras of Operators on Banach SPates
All automorphisms of the Calkin algebra are inner
All automorphisms of the Calkin algebra are inner
$K$-theory for commutants in the Calkin algebra.
The Calkin representation for a certain class of algebras of unbounded operators
Linear relations in the Calkin algebra for composition operators
Calkin algebras and algebras of operators on banach spaces / S. R. Caradus, W. E. Pfaffenberger, Bertram Yood
Algebras of convolution operators and their image in the Calkin algebra