Introduction. It is known that under many conditions, effective operators will be partial recursive, ([MS], [KLS], [L]). On the other hand, certain pathological examples have been constructed by Friedberg [F] and Pour-El [P] to show that effective operators are not always partial recursive. Pour-El has observed that although it is well known that all partial recursive operators are continuous, ...

conclusion we believe that active briefing of patients who need to undergo neck and bone biopsies and have high anxiety score by healthcare personnel is an effective method to control psychological mood and increase the efficiency of treatment. background ultrasound-guided biopsy procedures are the most prominent methods that increase the trauma, stress and anxiety experienced by the patients. ...