Mathematics
Harry Altman's user avatar
Harry Altman's user avatar
Harry Altman's user avatar
Harry Altman
  • Member for 13 years, 1 month
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About

Currently studying the complexity of natural numbers in various simple computational models, and occasionally unusual operations on ordinals. See website for more.

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All Questions Answers
Score Newest
question
124
Continuity of the roots of a polynomial in terms of its coefficients
Sep 9, 2011
answer
44
Are all $p$-adic number systems the same?
Jul 24, 2012
question
19
How to show $\ell^2_p$ not isometric to $\ell^2_{p'}$ unless $p\in\{1,2,\infty\}$?
Nov 20, 2010
question
17
Basic counterexample re: preimages of ideals
Oct 28, 2010
answer
14
Entire function with $f(z)=\sin(f(z))$ must be constant?
Dec 15, 2011
question
12
Is multiplication of games that are equivalent to numbers well-defined?
Sep 15, 2018
question
11
What is the shortest function of lambda calculus that generates all functions of lambda calculus?
Jun 3, 2012
answer
11
Fixed points of a holomorphic map on a simply connected domain
Nov 27, 2011
question
11
How can one prove the axiom of collection in ZFC without using the axiom of foundation?
Jan 20, 2016
question
8
What are these operations on ordinals, analogous to multichoose, called?
Feb 17, 2012
Top network posts
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69
What are the most attractive Turing undecidable problems in mathematics?
43
Examples of common false beliefs in mathematics
34
Examples of seemingly elementary problems that are hard to solve?
28
Are Minkowski sums of upward closed "convex" sets in $\mathbb{N}^k$ still "convex"? (WAS: Comparing mana costs in Magic: The Gathering)
28
Axiomatic definition of integers

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