According to whether the actor has expressed the intention, the behavior in the civil law can be divided into ideographic behavior and non-ideographic behavior. Ideographic behavior refers to the behavior performed by the actor through the expression of the intention; the non-ideographic behavior refers to the behavior performed by the party without the intention. It mainly includes factual acts and illegal acts. Factual acts refer to acts that the perpetrator does not subjectively create a civil legal relationship, but causes the consequences of a civil legal relationship in accordance with the provisions of the law.
According to the above definition, which of the following is a factual act?
Professor Wang wrote a paper and obtained the copyright of the paper