Prior to body, willing to note that this question would not be proper because of too vagueness of it.
Today I had met a person and been questioned below:
1) What is logic in mathematics?
2) Is it natural? never be dependent on "Human" ?
3) How does the mathematical society discern the logical consistency about a given proof? Is there any kind of agreement regarding "What the logic is" or does it depend on social agreement such as people do in social science or study of laws?