ABSTRACT
Once upon a time I was an undergraduate majoring in mathematics and statistics. I attended many lectures on probability theory, and my lecturers taught me many nice theorems involving probability: ‘P of this equals P of that’, and so on. One day I approached one of them after a lecture and asked him: ‘What is this “P” that you keep on writing on the blackboard? What is probability?’ He looked at me like I needed medication, and he told me to go to the philosophy department.
