An algebra teacher had just finished his lecture when he saw a female student... She had stayed behind after everyone else had left, furiously working away at proof exercises. The teacher walked up to her and said, ""Why are you working so hard?"" She looked up and responded: ""Harry Styles will marry me if and only if I finish top of my class."" The teacher looked bemused. ""How can you make such a claim?"" The student's face lit up. ""Well"", she said, ""let's say that I DO finish top of my cl…