A new paper purports to contain the final piece of a mathematical jigsaw puzzle: the invariant subspace problem ...

Octav Olteanu, Invariant Subspaces and Invariant Balls of Bounded Linear Operators, Bulletin mathématique de la Société des Sciences Mathématiques de Roumanie, Vol. 59(107), No. 3 (2016), pp. 261-271 ...

The Mathematical Gazette is the original journal of the Mathematical Association and it is now over a century old. Its readership is a mixture of school teachers, college and university lecturers, ...