چكيده فارسي :
Let A, B, and X be bounded linear operators on a complex
separable Hilbert space. We show that if a · A + A¤ · b for some real
numbers a and b, then for every unitarily invariant norm jjj:jjj,
jjjAX ¡ XA + A¤X ¡ XA¤jjj · (b ¡ a)jjjXjjj:
