154

Answers
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91
Interpreting the Famous Five equation
57
Elementary+Short+Useful
48
Suggestions for good notation
38
Applications of mathematics
34
Counterexamples in PDE
29
What are some correct results discovered with incorrect (or no) proofs? (2)
28
Is “Napkin conjecture” open ? (ORIGAMI)
27
Why do we care about L^p spaces besides p = 1, p = 2, and p = infinity?
26
Determinant of sum of positive definite matrices
26
On the non-rigorous calculations of the trajectories in the moon landings
22
What does the word “symplectic” mean?
21
Nonexistence of boundary between convergent and divergent series?
21
Are there smooth bodies of constant width?
19
Borel set plus a closed set = Borel
19
How did Bernoulli prove L’Hôpital’s rule?
18
Can we cover the unit square by these rectangles?
17
Parabolic envelope of fireworks
16
Abstract Thought vs Calculation
16
What was Weierstrass’s counterexample to the Dirichlet Principle?
16
Examples of non-rigorous but efficient mathematical methods in physics
16
Why are differential forms called closed and exact?
15
Is this number already known to be transcendental? Is there a survey about up-to-date trascendence results?
15
Which Fréchet spaces have a dual that is a Fréchet space?
14
Existence/Uniqueness of solutions to quasi-Lipschitz ODEs
14
Existence of a smooth function with nowhere converging Taylor series at every point
14
Does pointwise convergence imply uniform convergence on a large subset?
14
Polynomials having a common root with their derivatives
14
Examples of common false beliefs in mathematics.
13
What is the probability that the range of a set of N randomly chosen real numbers in [0, 1] is less than the reciprocal of N?
12
Why is the Laplacian ubiquitous?
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