KConrad

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Why is Lebesgue integration taught using positive and negative parts of functions?

real-analysis integration measure-theory asked May 18, 2010 at 18:29

mathoverflow.net

62 votes

who fixed the topology on ideles?

nt.number-theory ho.history-overview asked Oct 6, 2010 at 10:34

mathoverflow.net

58 votes

Looking for a definitive source about Dirichlet finally proving the Unit Theorem in the Sistine Chapel

number-theory math-history asked Aug 27, 2012 at 2:01

math.stackexchange.com

41 votes

Usage of "про" instead of "о"

выбор-слова предлоги asked Jun 14, 2012 at 3:47

russian.stackexchange.com

39 votes

Definitive source about Dirichlet finally proving the Unit Theorem in the Sistine Chapel

nt.number-theory ho.history-overview asked Sep 2, 2012 at 19:22

mathoverflow.net

33 votes

First use of term "Hilbert's Nullstellensatz"

ag.algebraic-geometry ho.history-overview asked May 2, 2021 at 15:40

mathoverflow.net

31 votes

When did Fubini's name get applied to the theorem without measures?

reference-request multivariable-calculus math-history asked Nov 7, 2011 at 17:41

math.stackexchange.com

28 votes

Why is "h" the notation for class numbers?

nt.number-theory ac.commutative-algebra notation asked Mar 4, 2010 at 6:27

mathoverflow.net

27 votes

Graduate program applications that require questionnaires and other non-letter material

soft-question big-list career asked Dec 17, 2014 at 4:50

mathoverflow.net

27 votes

What are applications of commutativity theorems for rings?

ra.rings-and-algebras commutative-rings asked May 27, 2015 at 16:51

mathoverflow.net

Top Answers

256

Consequences of the Riemann hypothesis

mathoverflow.net

222

Widely accepted mathematical results that were later shown to be wrong?

mathoverflow.net

119

Why it is important to write a function as sum of even and odd functions?

math.stackexchange.com

114

Why, historically, do we multiply matrices as we do?

math.stackexchange.com

112

Demystifying complex numbers

mathoverflow.net

Can you give an example of a complex math problem that is easy to solve?

math.stackexchange.com

Elementary results with p-adic numbers

mathoverflow.net

Where is number theory used in the rest of mathematics?

mathoverflow.net

In "splendid isolation"

mathoverflow.net

Mazur secret Bourbaki report "Analyse p-adique"

mathoverflow.net

There is a nice theory of quadratic forms. How about cubic forms, quartic forms, quintic forms, ...?

mathoverflow.net

Why is Galois correspondence intuitively plausible?

math.stackexchange.com

Are all algebraic integers with absolute value 1 roots of unity?

math.stackexchange.com

What are the advantages of phrasing results in terms of exact sequences and commutative diagrams?

mathoverflow.net

What's the "best" proof of quadratic reciprocity?

mathoverflow.net

Interesting results in algebraic geometry accessible to 3rd year undergraduates

mathoverflow.net

How were modular forms discovered?

mathoverflow.net

The Origin(s) of Modular and Moduli

mathoverflow.net

Cool problems to impress students with group theory

mathoverflow.net

Why do we care about $L^p$ spaces besides $p = 1$, $p = 2$, and $p = \infty$?

mathoverflow.net

Why are functional equations important?

mathoverflow.net

Why do we make such big deal about the 'unsolvability' of the quintic?

mathoverflow.net

Do you read the masters?

mathoverflow.net

sum of squares in ring of integers

mathoverflow.net

Is there a ring of integers except for Z, such that every extension of it is ramified?

mathoverflow.net

Irreducibility of $x^n-x-1$ over $\mathbb Q$

math.stackexchange.com

What is the p-adic valuation of a number?

mathoverflow.net

Intuitive explanation of Cauchy's Integral Formula in Complex Analysis

math.stackexchange.com

Collecting proofs that finite multiplicative subgroups of fields are cyclic

mathoverflow.net

Are submodules of free modules free?

mathoverflow.net