What is the hardest type of math?

Determining the "hardest" type of math is subjective and depends on individual strengths, interests, and background. However, some branches of mathematics are often considered more advanced and challenging due to their abstract nature and complexity. These include:

1. Advanced Calculus and Analysis: Topics like real analysis and complex analysis can be quite challenging, delving into rigorous proofs and abstract concepts.

2. Abstract Algebra: This branch involves studying algebraic structures, such as groups, rings, and fields, and can be highly abstract and theoretical.

3. Topology: Topology explores properties of space that remain unchanged under continuous deformations, and it can involve intricate concepts and advanced mathematical reasoning.

4. Differential Geometry: This area of mathematics connects calculus and geometry, dealing with smooth surfaces and curves in higher-dimensional spaces.

5. Functional Analysis: This branch extends ideas from linear algebra and calculus to infinite-dimensional spaces, introducing abstract concepts and complex mathematical structures.

6. Number Theory: Focusing on the properties of integers and number patterns, number theory involves deep mathematical reasoning and has connections to cryptography and computer science.

7. Mathematical Logic: This area deals with the foundations of mathematics and the study of formal systems. It can involve complex symbolic manipulation and logical reasoning.

Keep in mind that what one person finds challenging, another might find more accessible based on their background and interests. Additionally, the perceived difficulty of a mathematical topic can vary based on how it is taught and the resources available.