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Yesterday, 22:16

MarkFL replied to a thread BBCode For Username HTML Markup in vBulletin Products

Update - Version 1.3.1: Bug fix for usernames with special characters.

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2 replies | 198 view(s)
Yesterday, 19:16

Jameson replied to a thread Error 502, bad gateway in Questions, Comments, and Feedback

Thank you very much for pointing this out! This is a huge security vulnerability related to the username markup add-on. I found a way to fix that...

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15 replies | 420 view(s)
Yesterday, 19:16

MarkFL replied to a thread Error 502, bad gateway in Questions, Comments, and Feedback

I have added code to that external script so a single quote in a username won't throw an error, and I edited the post so that only the username is...

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15 replies | 420 view(s)
Yesterday, 12:00

MarkFL started a thread Problem Of The Week #310 Apr 20th, 2018 in POTW for Secondary School/High School Students

Here is this week's POTW: A small bug is placed between two blocks of masses $m_1$ and $m_2$ ($m_1>m_2$) on a frictionless table. A horizontal...

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0 replies | 20 view(s)
Yesterday, 11:59

MarkFL replied to a thread Problem Of The Week #309 Apr 12th, 2018 in POTW for Secondary School/High School Students

No one answered this week's problem, and my solution is as follows: A formula for power $P$ we can apply here is: P=\frac{1}{2}\mu\omega^2A^2v...

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1 replies | 63 view(s)
Yesterday, 02:40

topsquark replied to a thread Matrices in Linear and Abstract Algebra

As with your last post most of these are plug-n-chug. Do you even know the basics definitions? How do you define the determinant of a 2 x 2 matrix?...

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1 replies | 48 view(s)
April 19th, 2018, 18:27

topsquark replied to a thread Sequences and Series in Analysis

Do you mean to say you can't do 2 and 4?? What are the possible values for n? Do you know what an nth partial sum is? Hint: 3 is a geometric...

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2 replies | 64 view(s)
April 19th, 2018, 16:23

topsquark replied to a thread The Chromatic Number of the Plane is at Least 5 in Chat Room

Okay, why isn't the number four? Is this diagram of his not flat in the plane? I messed around with the 4 color theorem as a kid and I heard it was...

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2 replies | 41 view(s)
April 19th, 2018, 14:12

Euge replied to a thread Irreducible Polynomial g = X^4 + X + 1 over F2 in Linear and Abstract Algebra

You can start with $\alpha^4 = \alpha + 1$, multiply by $\alpha$ and reduce (if necessary). Then repeat the procedure. If in case you don't want to...

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3 replies | 88 view(s)
April 19th, 2018, 10:33

Ackbach started a thread The Chromatic Number of the Plane is at Least 5 in Chat Room

I love this stuff! An amateur gets this one, though his result is refined by the pros. His paper on arXiv is here.

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2 replies | 41 view(s)
April 19th, 2018, 09:38

Ackbach started a thread Problem Of The Week # 306 - Apr 19, 2018 in POTW for University Students

Here is this week's POTW: ----- What is the largest possible radius of a circle contained in a $4$-dimensional hypercube of side length $1?$ ...

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0 replies | 22 view(s)
April 19th, 2018, 09:36

Ackbach replied to a thread Problem Of The Week # 305 - Apr 10, 2018 in POTW for University Students

Congratulations to castor28 for his correct solution, and an honorable mention to kiwi for a mostly correct solution, to this week's POTW, which was...

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1 replies | 66 view(s)
April 19th, 2018, 07:45

Jameson replied to a thread [SOLVED] Hypothesis testing - Winning a game in Advanced Probability and Statistics

Sorry mathmari! I quickly read the question and saw that you were formulating a two sample question but I didn't catch that it could be condensed...

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10 replies | 78 view(s)
April 18th, 2018, 21:59

Jameson replied to a thread [SOLVED] Hypothesis testing - Winning a game in Advanced Probability and Statistics

Hey mathmari, I would use the second way to frame this. This link should be useful for comparing two samples of proportions. - Not a two...

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10 replies | 78 view(s)
April 18th, 2018, 00:57

Euge replied to a thread Problem of the Week #268 - Apr 03, 2018 in POTW for Graduate Students

Seeing that users are having some trouble, I’m giving another week for POTW submissions and corrections. You might find it useful to show first that...

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1 replies | 86 view(s)
April 17th, 2018, 10:04

Opalg replied to a thread Most ever users in Chat Room

It looks as though Spring Break has brought out the users again! It now says Most users ever online was 439, April 15th, 2018 at 19:20.

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2 replies | 312 view(s)
April 17th, 2018, 03:51

Opalg replied to a thread Finding last digits of 983389^389 in Number Theory

Hi Alexthexela, and welcome to MHB! In the number $983,389^{389}$, the base is $983,389$ and the exponent is $389$. The problem tells you to...

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1 replies | 85 view(s)
April 16th, 2018, 13:57

Euge replied to a thread Irreducible Polynomial g = X^4 + X + 1 over F2 in Linear and Abstract Algebra

Welcome, aadams! (Wave) Your answer to (a) looks fine. To answer part (b), you can compute the powers $\alpha^n$ for $n = 1,2,\ldots, 15$ using...

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3 replies | 88 view(s)
April 16th, 2018, 12:25

Opalg replied to a thread Compute \, S^k k=2,...,6 in Linear and Abstract Algebra

In the UK, it is the leading supplier of accounting software packages for small businesses, https://uk.sageone.com/accounts/. I would not...

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7 replies | 110 view(s)
April 16th, 2018, 07:33

topsquark replied to a thread Compute \, S^k k=2,...,6 in Linear and Abstract Algebra

The "other Forum" had a simple question that never got answered as far as I know. What the (Swearing) is "SAGE?" -Dan

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7 replies | 110 view(s)
April 15th, 2018, 20:01

MarkFL replied to a thread A Difficult Partial Sum in Pre-Calculus

Awesome work, as always Chris! (Yes) Using your post, where the base case and induction statement have been given, then the induction step would...

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6 replies | 124 view(s)

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We are an online community that gives free mathematics help any time of the day about any problem, no matter what the level. You will have to register before you can post. To start viewing messages, select the forum that you want to visit from the selection below.

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Chris L T521

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