erfink

Mathematics PhD, studying dynamical systems, hyperbolicity, tiling spaces, and fiber optics

top accounts reputation activity subscriptions

Reverse engineering "nice" matrices from the eigenvalues

linear-algebra matrices eigenvalues-eigenvectors asked Apr 6, 2017 at 9:24

math.stackexchange.com

23 votes

Tutoring a recalcitrant/awkward/exasperating student---special needs?

undergraduate-education calculus tutoring special-needs-education asked Mar 14, 2017 at 22:42

matheducators.stackexchange.com

21 votes

Grating mathematical phrases---How to correct?

students-mistakes notation phrasing asked Mar 16, 2017 at 2:59

matheducators.stackexchange.com

17 votes

What extra gear to take up a multipitch climb?

gear rock-climbing climbing multi-pitch asked Apr 24, 2018 at 9:29

outdoors.stackexchange.com

10 votes

Pick the right notation for calculus!

calculus derivatives soft-question notation math-history asked Mar 16, 2017 at 9:11

math.stackexchange.com

10 votes

Straps around Olympic Halfpipe Snowboarder Legs?

snowboarding asked Feb 14, 2018 at 1:47

outdoors.stackexchange.com

10 votes

Build a Companion Matrix of a Polynomial?

matrix linear-algebra polynomials asked Apr 8, 2017 at 20:06

mathematica.stackexchange.com

9 votes

Create lists of equivalences from pairs

list-manipulation performance-tuning asked Oct 3, 2018 at 19:10

mathematica.stackexchange.com

7 votes

Hopcroft's Algorithm for Minimization of Deterministic Finite State Automaton

performance-tuning graphs-and-networks algorithm asked Feb 9, 2019 at 21:12

mathematica.stackexchange.com

7 votes

Differing behavior of Eigenvalues and Eigensystem

matrix linear-algebra eigenvalues asked May 13, 2020 at 10:15

mathematica.stackexchange.com

Top Answers

Is talking to a professor about personal issues acceptable?

academia.stackexchange.com

Hilbert's hotel: why can't I repeat it infinitely many times?

math.stackexchange.com

When hiking, why is the right of way given to people going up?

outdoors.stackexchange.com

The need for the Gram–Schmidt process

math.stackexchange.com

Request for examples: verifying vs understanding proofs

mathoverflow.net

How could Wolfram Research increase Wolfram Language adoption?

mathematica.stackexchange.com

In outdoor sport climbing, why are bolts placed so far apart?

outdoors.stackexchange.com

What extra gear to take up a multipitch climb?

outdoors.stackexchange.com

‘Lies to children’ in mathematics and statistics education

matheducators.stackexchange.com

Compromised Ropes in Retail Stores

outdoors.stackexchange.com

How to choose a good grading curve for yes/no exams?

academia.stackexchange.com

How exactly does Knuth's Up-Arrow notation work?

math.stackexchange.com

Concerns about the value of the research domain

academia.stackexchange.com

What is a Flamenco Word™?

puzzling.stackexchange.com

Determinant of a matrix with diagonal entries $a$ and off-diagonal entries $b$

math.stackexchange.com

How to progress in rock climbing after grades v4 / 5.11+?

outdoors.stackexchange.com

Is there a utility / method to organize trad gear so that each piece is immediately accessible?

outdoors.stackexchange.com

How do choices in design of a paddle-craft influence its handling characteristics?

outdoors.stackexchange.com

What to tell professors to persuade them to let me (pre-college student) work with them (follow up to question)

academia.stackexchange.com

What type of knife should I carry while rock climbing?

outdoors.stackexchange.com

When did indoor climbing gyms start to become popular?

outdoors.stackexchange.com

Is it possible to estimate the speed of a passing vehicle using a musical ear and the doppler effect?

physics.stackexchange.com

Why do almost all backpacking packs have top compartment ("brain compartment") zippers facing backwards?

outdoors.stackexchange.com

Relation of ski edge sharpening to skiing ability and snow conditions

outdoors.stackexchange.com

What exactly is calculus?

math.stackexchange.com

Unexpected use of topology in proofs

math.stackexchange.com

How to deal with a colleague who won't accept they're wrong

academia.stackexchange.com

Origin of the "bell curve" for rock climbing route setting

outdoors.stackexchange.com

How to begin trail / fell running?

outdoors.stackexchange.com

What are the effects of biking on hiking trails?

outdoors.stackexchange.com