Original sentence: (This subspace only exists in a rigged Hilbert space because the momentum spectrum is continuous, but that is not an essential detail except to mathematicians.) It is spanned by E, , M and Lij.Or from another point of view, it is an essential detail except to non-mathematicians
Edited sentence: (This subspace only exists in a rigged Hilbert space because the momentum spectrum is continuous, but that is not an essential detail except to mathematicians) It is spanned by E, , M and Lij