sentences:  Can it determine, in a finite number of steps, whether it, itself, is “successful” and "truthful" (that is, it does not get hung up in an endless "circle" or "loop", and it correctly yields a judgment "truth" or "falsehood" about its own behavior and results)?At the 1928 Congress [in Bologna, Italy] Hilbert refines the question very carefully into three parts.The following is Stephen Hawking's summary