clearz wrote: »
A patient p may or may not have a genetic disease x.
p wants to know if the don't have x but also wants to remain blissfully unaware if he does have x.
A doctor d can tell p if he has or has not got the disease x by preforming a test.Is it possible for p to acquire the information from d only if it is good news without being able to infer the opposite.
For instance if the person tells the doctor to only tell him if it is good news and the doctor comes back and says nothing. Then the
news is inferred as being bad.
The doctor could promise the patient not to tell him either way. Then renege on her promise only if it is good news. The patient has to
be 100% convinced the doctor will not renege before hand otherwise an inferrel can again be made by the doctors silence if it is bad news.
So is it possible?