Pietro Majer

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Name	Pietro Majer
Member for	3 years
Seen	Jun 12 at 8:55
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I am a professor at the University of Pisa, Italy.

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The functional equation $f(f(x))=x+f(x)^2$

apr 8 12 at 3:50 Sylvain Bonnot 560●1●4●5

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A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.

co.combinatorics pr.probability puzzle

mar 8 11 at 10:41 Pietro Majer 19.8k●1●25●70

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932

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Asymptotic growth of a certain integer sequence

co.combinatorics asymptotics sequences partitions

jan 23 at 13:06 Pietro Majer 19.8k●1●25●70

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I know that you know…

game-theory mathematical-modeling

may 25 at 11:48 patty 1●2

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Genealogy of the Lagrange inversion theorem

ho.history-overview cv.complex-variables co.combinatorics

may 23 10 at 1:47 Scott Guthery 659●3●7

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917

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Integral representation of higher order derivatives

ca.analysis-and-odes taylor-series reference-request

mar 25 at 19:37 Peter Michor 6,386●1●15●20

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answer

689

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Banach spaces with few linear operators ?

banach-spaces oa.operator-algebras

jul 5 10 at 20:26 Yemon Choi 8,608●1●20●45

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418

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Closed connected additive subgroups of the Hilbert space.

hilbert-spaces topological-groups fa.functional-analysis

oct 18 11 at 10:15 Pietro Majer 19.8k●1●25●70

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answer

520

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Intersection of complemented subspaces of a Banach space

banach-spaces fa.functional-analysis ask-johnson

jan 13 12 at 13:17 Pietro Majer 19.8k●1●25●70

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785

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Infinite convex combinations in a Banach space

convexity banach-spaces reference-request

feb 22 11 at 12:17 Pietro Majer 19.8k●1●25●70

389

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Suggestions for good notation

German mathematical terms like “Nullstellensatz”

Need help proving that $\sum\limits_{j=0}^{k-1}(-1)^{j+1}(k-j)^{2k-2} \binom{2k+1}{j} \ge 0$

Why do we teach calculus students the derivative as a limit?

What is your favorite proof of Tychonoff’s Theorem?

Square of a continuous map

Making N (set of all positive integers) a group

Expressions involving Eulerian numbers of the second kind: trying to show $\sum_{m=0}^{n} (-1)^m(m)m!(2n-m-2)!\left\langle\left\langle n\atop m\right\rangle\right\rangle\neq0$ for even $n$. (2)

What if Current Foundations of Mathematics are Inconsistent?

Are there such numbers?

A Hölder continuous function which does not belong to any Sobolev space

How do professional mathematicians learn new things?

The vector field of a given flow

Is a real power series that maps rationals to rationals defined by a rational function?

Noncombinatorial proofs of Ramsey’s Theorem?

How to compute \prod_{n=1}^{\infty} (1-p^{-n})

Math puzzles for dinner (2)

Asymptotic approximation of $x^\alpha$ by entire functions

is f a polynomial provided that it is “partially” smooth?

Pythagorean 5-tuples

Explicit Hamel basis of real numbers

Easier induction proofs by changing the parameter

Searching for an unabridged proof of “The Basic Theorem of Morse Theory”

is the limit of ergodic functions still ergodic?

ODE’s without a Lipschitz condition

Products of prime powers less than a number.

If $f$ is smooth and even then there exists a smooth function $g$ such that $f(x)=g(x^2)$

Does any research mathematics involve solving functional equations?

Bounding largest eigenvalue

What is an isomorphism of Banach spaces?

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Pietro Majer

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Questions

The functional equation $f(f(x))=x+f(x)^2$

A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.

Asymptotic growth of a certain integer sequence

I know that you know…

Genealogy of the Lagrange inversion theorem

Integral representation of higher order derivatives

Banach spaces with few linear operators ?

Closed connected additive subgroups of the Hilbert space.

Intersection of complemented subspaces of a Banach space

Infinite convex combinations in a Banach space

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