Geodesic
The decomposability of operators relative to two subspaces
Studia Mathematica, Tome 105 (1993) no. 1, pp. 25-36 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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Let M and N be nonzero subspaces of a Hilbert space H satisfying M ∩ N = {0} and M ∨ N = H and let T ∈ ℬ(H). Consider the question: If T leaves each of M and N invariant, respectively, intertwines M and N, does T decompose as a sum of two operators with the same property and each of which, in addition, annihilates one of the subspaces? If the angle between M and N is positive the answer is affirmative. If the angle is zero, the answer is still affirmative for finite rank operators but there are even trace class operators for which it is negative. An application gives an alternative proof that no distance estimate holds for the algebra of operators leaving M and N invariant if the angle is zero, and an analogous result is obtained for the set of operators intertwining M and N. 
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A. Katavolos. The decomposability of operators relative to two subspaces. Studia Mathematica, Tome 105 (1993) no. 1, pp. 25-36. doi: 10.4064/sm-105-1-25-36

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