Honestly, beautiful maths mostly starts “after Calculus”: Analysis, Abstract Algebra, and beauty is in proofs. Although, you can check Combinatorics, Geometry,

Honestly, beautiful maths mostly starts “after Calculus”: Analysis, Abstract Algebra, and beauty is in proofs. Although, you can check Combinatorics, Geometry, and Number Theory up to some point. A good book I could recommend is Concrete Mathematics: https://en.m.wikipedia.org/wiki/Concrete_Mathematics https://en.m.wikipedia.org/wiki/Concrete_Mathematics