I have no formal education in pure maths.
I was gifted at maths at school (a long time ago), virtually all of which I have now forgotten. Then I read mathematical economics, econometric methods and the theory of statistics under Professor Pesaran and others at Cambridge University. Most of which I have also forgotten.
I'm the alien on the Collatz conjecture's face. Apologies in advance for cranky questions - it is not intentional!