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Conferences  The CTK Exchange Thoughts and Suggestions |
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Discussion Topic |
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Last Updated Date/Author |
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Number of Factors of an Integer
Even Alexander nods! You say: "there is no integer with exactly 48 factors".
294912 = 2^15*3^2 is the smallest such number.
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quodlibet  |
May-19-11 06:36 AM
by alexb |
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Typo in function
Reference: http://www.cut-the-knot.org/recurrence/guess.shtml#solution
Issue: Near the bottom, Penrose's sequence: the func... |
Andrew M-O |
May-12-11 10:51 PM
by alexb |
1
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Bear born on Tuesday problem
The problem was originally stated as:
"If, say, it is known that one of the bears is a male born on a Tuesday, what is the probability ... |
Julian Franklin |
May-03-11 10:11 PM
by Jon Hughes |
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Trigonometric proof of the Pythagorean Theorem
While I find Jason Zimba's proof interesting, I am puzzled why it should have taken so long for someone to cast a proof of the Pythagorean Theorem... |
jdawson |
Apr-03-11 10:48 PM
by alexb |
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Can't run java applets
Page ChebyshevTest.shtml offers two java applets that do not run on any reasonable security setting of IE8, even if I list your site as a trusted in... |
David W |
Mar-14-11 03:13 PM
by alexb |
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Cantor Set
Do you really need compactness in the first proof that C - C = ?
It seems to me that {Bi} and {Ci} converge on their own...
Ref... |
Paolo Di Muccio |
Feb-18-11 11:46 AM
by alexb |
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Trigonometric proof of Pythagorean theorem (proof 84).
What is actually meant by trigonometric proof of Pythagorean theorem?
Trigonometric functions are defined in analysis by infinite series. All of t... |
Janez Lesjak |
Feb-08-11 07:41 PM
by alexb |
3
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Small error in the proof for the Bernstein-Schroder theorem
In property (3) of the lemma you have:
Y = f(X) U (B - f(X))
When I think you intended the Y to be B.... |
kmdmkmd |
Jan-17-11 11:53 PM
by alexb |
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Isoperimetric inequality
I very much enjoyed your page on the Isoperimetric inequality (http://www.cut-the-knot.org/do_you_know/isoperimetric.shtml). I had a lo... |
Jonathan |
Jan-14-11 08:24 AM
by alexb |
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Drawing matches
The page on conditional probability calculates probabilities of drawing the short match. Among other things, there are several fraction divisions th... |
Alexei |
Jan-14-11 07:53 AM
by alexb |
2
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Huntington-Hill's voting method
I have a problem about the voting method Huntington-Hill's disucss in this website.
It seems that under the rule of this method, even if a pa... |
mathlover |
Nov-16-10 03:28 PM
by mathlover |
2
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Missing expression in a proof
Dear Alex,
it's on the page:
http://www.cut-the-knot.org/wiki-math/index.php?n=MathematicalOlympiads.USA1984Problem1
%... |
C. Reineke |
Oct-07-10 02:19 PM
by alexb |
5
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error in 'Ceva's Theorem: A Matter of Appreciation'
Stumbled across this site and hit some semi-random pages with great interest. However, I found what I think is an error in "Ceva's Theorem: A... |
Wayne |
Oct-03-10 12:20 PM
by alexb |
1
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Missing Java Class File?
The Java applet at http://www.cut-the-knot.org/Curriculum/Geometry/PossibleImpossible.shtml, doesn't work for me.
The Java console t... |
Odinsonnah |
Oct-01-10 02:44 PM
by alexb |
1
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Properties of GCD and LCM: Lemma proof
I'm confused by the proof of the Lemma for the Chinese Remainder Theorem on the page titled "Properties of GCD and LCM." The Lemma is (or the... |
John |
Sep-26-10 10:08 AM
by alexb |
2
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Pondering the Delian Problem
Hi, I was just reading the article on showing that the Delian problem is solvable and wondered about a few things. I was hoping that someone could e... |
Ian |
Sep-10-10 11:18 AM
by alexb |
1
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100 Prisoners and a Light Bulb puzzle
[View All]
Hi, the solution provided for this puzzle - both yours and Stuart Andersen's (http://www.cut-the-knot.org/Probability/LightBulbs.shtml... |
Arie Nimkovsky |
Sep-10-10 11:01 AM
by nightrider |
22
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Proof of the Pythagorean Theorem (and Law of Cosines)
I thought you might be interested in (yet) another proof of the Pythagorean Theorem, but I wasn't sure where to post it.
Actually, wha... |
Don McConnell |
Sep-08-10 10:33 AM
by mr_homm |
15
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Desargues flaw
Dear Alex
There seems to be a flaw in the second part of the proof:
"The proof above then applies to the triangles A1B1C1' and A2B2C2'... |
acco |
Sep-07-10 06:50 PM
by alexb |
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Josephus Flavius Simple Solution
There is a much easier way to solve the Josephus Flavius puzzle than any of the webpages.
Note:
This solution references the starting positio... |
Modular Math |
Aug-17-10 11:53 PM
by Modular Math |
0
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Maximum Area Property of Equilateral Triangles
Dear Alex,
The message is related Maximum Area Property of Equilateral Triangles:
http://www.cut-the-knot.org/triangle/InscribedE... |
Bui Quang Tuan |
Aug-11-10 11:53 PM
by Bui Quang Tuan |
0
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Computer error
Dear Alex,
the article on the page
http://www.cut-the-knot.org/arithmetic/algebra/Scott.shtml
is very interesting, but ... |
C. Reineke |
Jul-09-10 08:35 AM
by alexb |
8
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Newton & Roots
Hello everybody!
I found this one => http://www.cut-the-knot.org/wiki-math/index.php?n=Calculus.ApproximationOfRoots
on your W... |
John Ungar |
Jun-28-10 08:54 AM
by C. Reineke |
2
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Irrational numbers
Dear Alex,
yesterday I came across your page:
http://www.cut-the-knot.org/do_you_know/irrat.shtml
Noone seems to notice t... |
C. Reineke |
Jun-24-10 08:01 AM
by alexb |
1
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Pentagon Approximation Credited to Durer
The construction of an approximate pentagon from a vesica (as in page http://www.cut-the-knot.org/pythagoras/DurerPentagon.shtml) is oft... |
Dave Blake |
Jun-21-10 09:21 AM
by alexb |
3
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Another Solution For Cutting Triangles off Regular Hexagon
Dear Alex,
May be following my solution for problem "Cutting Triangles off Regular Hexagon":
http://www.cut-the-knot.org/tri... |
Bui Quang Tuan |
Jun-16-10 02:45 PM
by alexb |
6
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Two typos in a proof
Dear Alex,
the typos are on the page:
http://www.cut-the-knot.org/wiki-math/index.php?n=MathematicalOlympiads.AMO2010Probl... |
C.Reineke |
Jun-14-10 01:14 PM
by alexb |
1
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Impossible to find circle center with only a straightedge?
Two questions:
Exactly how is the given circle identified without identifying a center point or a point whose distance from the center point re... |
bennettjw |
Apr-12-10 12:52 PM
by alexb |
4
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Error on Proofreading page
http://www.cut-the-knot.org/Probability/Proofreading.shtml
There's a reference to "Earnst" Rutherford - the name is Ernest.
... |
Matt Westwood |
Mar-11-10 06:22 PM
by alexb |
1
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Parallel Lines and Similar Triangles
http://www.cut-the-knot.org/Curriculum/Geometry/ParallelLinesAndSimilarTriangles.shtml
"The problem is: in ΔABC draw l... |
Michelle |
Mar-09-10 11:18 AM
by alexb |
1
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