Depends on which math and which person.
A person whom ability in math, only punctuates to their proclivity of a certain intellectual degree.
If a person biological brain can only comprehend Algebra,
Then logically that would the the hardest type of math for that individual .
The better question would be- what is the most scarce mathematics problems solved among humans.
These are the known fields for scarcity among human participants that involve math
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Chemistry
Physic
Engineer
Astronomy
out of all these subject psychics takes first with the fewest participants around the world.
their are less then 50,000 physicist word wide-
Now there two different type of mathematics.
Solvable and Unsolvable.
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Solvable mathematics are proven mathematics in the fields, all you need is the formula.
a unsolvable math problem is a theory of mathematics that has yet to be solved and proven.
In conclusion The hardest math problem within the world , would be the most scarce field for mathematics with the longest unsolved theory over the years.
Currently at the moment the hardest physic math would be:
"Fermt's Last Theore" be unsolved for 375 years.
The hardest question is too difficult to conjure.
Different people find different things difficult. So what you might find difficult someone else might find easy. And, what someone else finds difficult, you might find easy. As a result, there is no hardest type.
That is based on opinion.
Proving the Riemann conjecture.
What is the exact value of pi in figures.
math
The hardest question is too difficult to conjure.
no it is not hard
Math is the hardest question, if you dont understand it.
AP CALCULAS AP CALCULUS* is not the hardest math. Analysis, Set theory, Algebra, Topology, Calculus and Number Theory
HL math
Different people find different things difficult. So what you might find difficult someone else might find easy. And, what someone else finds difficult, you might find easy. As a result, there is no hardest type.
The Collatz conjecture
All you need to do is math, math, math! Also, in level one, go diagonal!
That is based on opinion.
Proving the Riemann conjecture.
No. Some of the world's hardest maths problems have remained unsolved for centuries.