How does certainty enter into the mind?

Any problem is concerned with the mind, but what do minds make a decision on? Here we show that there are three conditions for the mind to make a certain answer. We found that some difficulties in physics and mathematics are in fact introduced by infinity, which can not be rightly expressed by minds. Based on this point, we suggest a general observation system, where we use region (a type of infinity) to substitute for infinitesimal (another type of infinity) and thus get a consistent image with the mind. Furthermore, we declare that without world pictures we can never have ideas to any expressive events, which is the primary condition for a wave function like mind to collapse to a series of numbers. A following observation by expanding algorithm brings the final collapse: classifying the numbers and coming up with a certain yes or no answer. There is no bigger question than the mind one in nature. All scientific, economic and cultural actions are exerted by the minds and in the end for the minds. The meaning of nature lays in its being sensed. Anything can not be sensed or observed is out of science scope. One interesting problem about mind comes from experiment performed by Libet: time-delays of consciousness [1]. The experiment includes two parts. The first part shows that it took about half a second before a stimulus applied to the skin to be consciously aware of, but no subjective delay feeling can be sensed. And the second part says that the order of stimuli on the skin and corresponding point of the somatosensory cortex are false perceived. A late stimulus on the skin was sensed as occurred before a former one of the cortex. The astonishing delay caused Libet to 2 believe that there is no free will. We will not discuss whether there is free will here, we focus on how minds sense. But to the experiment, we have two certain points. One is that time order is not so absolute to mind (it does match relativity theory), the other is time threshold is necessary to cause a sensation. It is undoubted that minds can perceive events within a certain time and space. But can minds locate infinitesimal? Or, is there any sensible infinitesimal? It seems no. On one side, we see thresholds everywhere, especially to the mind. One early work in this field by Weber …