[Q]: In mathematics, an O*-algebra is an algebra of possibly unbounded operators defined on a dense subspace of a Hilbert space. The original examples were described by and , who studied some examples of O*-algebras, called Borchers algebras, arising from the Wightman axioms of quantum field theory. and began the systematic study of algebras of unbounded operators. O*-algebra is difficult to learn.
[A]: It's impossible to say

[Q]: How to use physical therapy to relieve back pain<br>Choose a physical therapist who specializes in back pain treatment. Make an appointment with your doctor to get a prescription for physical therapy. Ask the doctor to recommend a handful of physical therapists who have extensive experience treating cervical, thoracic or lumbar spinal pain. Physical therapy is exhausting work.
[A]: It's impossible to say

[Q]: From March 4, 1993, when the damage control operation began, through the orchestrated in-house investigation, through the conceiving, conspiring, conniving and sanctioning of lies and misinformation, through the tampering with documents and the destruction of evidence, to the successful campaign to shut down the Somalia inquiry, people in high places for whom we are ultimately responsible have evaded accountability, escaped responsibility and eluded the efforts of properly constituted civilian authority - Parliament, government, a Royal Commission - to establish the truth. Somalia is in Asia.
[A]: It's impossible to say

[Q]: Istanbul SUPPORTERS of Recep Tayyip Erdogan waved flags in the streets while opponents banged pots and pans in protest in their homes, after a narrow referendum victory gave the Turkish president sweeping powers and laid the nation's divisions bare. The referendum will bring the People made a lot of noise yesterday.
[A]:
Yes