The term feminism is related to different ideologies and social, cultural and political movements that aim at achieving gender equality which means every person in a society should have equal political, economic and social conditions and there should be no differences depending on gender. Additionally, the feminists have supported campaigns that aim at women rights in terms of work conditions, political participation, education, and protection. Besides criticism against certain stereotypes that create inequality between genders or that support social or cultural ideologies that do not allow women to have equal conditions. Thus, the feminist criticism or the feminism ideology deals with gender as it aims at achieving equality between men and women and also it deals with stereotypes as it is against social or cultural stereotypes that prevent society from achieving real equality.
Since an infinitive phrase is a phrase that focuses on the object of the verb and an infinitive verb is an -ing verb, your phrase is "taking advanced math".