For those studying math: which is your preferred subfield?

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Hi, all. As for my mathematical interests/preferred subfields, I am currently studying Set Theory and Logic, Group Theory, and Algebraic Topology. I especially find Large Cardinals and Model Theory to be quite elegant.

I was always partial to Differential Geometry.

Favorites: Algebra and Trigonometry.

Calculus?  I have not used it much since Uni (and not at all since retirement), but I needed the credits for my engineering degree.