Search found 14 matches

by Excalibur0998
Wed Mar 10, 2010 10:20 pm UTC
Forum: Mathematics
Topic: Math Summer 2010 Dilemma
Replies: 6
Views: 1793

Re: Math Summer 2010 Dilemma

You could also try calling up the Graduate Admissions people at the schools you're looking at and asking them.
by Excalibur0998
Wed Aug 26, 2009 6:10 pm UTC
Forum: Mathematics
Topic: Simple Sequences and Series
Replies: 6
Views: 900

Re: Simple Sequences and Series

Perhaps somewhat surprisingly, the formula for the number of cups in an k-dimensional pyramids of edge length n is a lot simpler. Hint: factor the polynomials in the answers you've already gotten. Also, spending hours filling whiteboards with guesses and random theories is at least half the fun. Da...
by Excalibur0998
Wed Aug 26, 2009 12:33 am UTC
Forum: Mathematics
Topic: Simple Sequences and Series
Replies: 6
Views: 900

Simple Sequences and Series

I've never been all that great at sequences and series...so I ran into a little bit of trouble when my roommate and I came up with a simple problem. The problem is an expression for the number of cups in beer pong based on how many rows there are. Just by guess and check, I found the expression \sum...
by Excalibur0998
Sun Jul 26, 2009 1:47 am UTC
Forum: Mathematics
Topic: Post your interesting/challenging/fun integrals
Replies: 53
Views: 9040

Re: Post your interesting/challenging/fun integrals

What does the graph of y^5 = 1 - x^7 look like? How does it relate to the graph of y^7 = 1 - x^5 ? I put them into wolfram alpha, and they look very similar...but what does y^5 = 1 - x^7 have to do with (1 - x)^7 ? Anyway, I finally sort of gave up on this integral so I went to my dad and h...
by Excalibur0998
Fri Jul 03, 2009 4:14 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0605: "Extrapolating"
Replies: 100
Views: 24117

Re: "Extrapolating" discussion

thanks Randall, I really needed those laughs :D Hmm, but why a straight line? It could be a sine wave, or exponential... *considers the extrapolation involved in radiometric dating, which has a tendency to fail on rocks of known age* remember kids, radiometric dating is Blind Dating! Seeing how pol...
by Excalibur0998
Fri Jul 03, 2009 1:29 am UTC
Forum: Fit Club
Topic: Personal Records
Replies: 159
Views: 61323

Re: Personal Records

duckshirt wrote:
Excalibur0998 wrote:Boston Marathon
How'd it go? I knew a guy who ran it today, started out pretty fast, and got hit pretty hard by Heartbreak Hill :_ ...


Unfortunately, I only qualified for the 2010 Boston Marathon. I have to wait another year to do it :(
by Excalibur0998
Mon Jun 29, 2009 8:13 pm UTC
Forum: Logic Puzzles
Topic: Raven's Progressively More Annoying Matrices
Replies: 46
Views: 74585

Re: Raven's Progressively More Annoying Matrices

Have you considered...
Spoiler:
That it's just simple transformations?


I found an example:
Spoiler:
The top right square and the center left square are 90 degree rotations. Same with center right and bottom left.


Edit: I got beat'd.
by Excalibur0998
Wed Apr 01, 2009 2:03 am UTC
Forum: Fit Club
Topic: Personal Records
Replies: 159
Views: 61323

Re: Personal Records

Just ran my marathon a week ago. Pretty awesome experience. Boston, here I come!

Marathon - 3:05:06
5k - 17:31
1600 - 4:40
800 - 2:06
by Excalibur0998
Sat Feb 21, 2009 4:30 pm UTC
Forum: Mathematics
Topic: Straightedge and graph paper geometry
Replies: 25
Views: 2326

Re: Straightedge and graph paper geometry

Yeah, I meant the converse, my bad.
by Excalibur0998
Sat Feb 21, 2009 1:44 am UTC
Forum: Mathematics
Topic: Straightedge and graph paper geometry
Replies: 25
Views: 2326

Re: Straightedge and graph paper geometry

How about this.

You can create your infinite sheet of graph paper using a straightedge and compass.
Therefore anything you can't do with a straightedge and compass you also can't do with a sheet of graph paper.

Contrapositive isn't true though.
by Excalibur0998
Thu Jan 01, 2009 1:46 am UTC
Forum: Science
Topic: Science Books
Replies: 1
Views: 518

Re: Science Books

I'm extremely interested in this subject as well. The Physics of Musical Instruments by Thomas Rossing and Neville Fletcher is one of my favorites. It's pretty heavy on the math which is part of the reason I like it. He derives wave equations for you in a bunch of different acoustical systems (strin...
by Excalibur0998
Mon Dec 22, 2008 8:43 pm UTC
Forum: Fit Club
Topic: Personal Records
Replies: 159
Views: 61323

Re: Personal Records

800 - 2:06
1600 - 4:40
5k - 17:31

I'm running a marathon in march and I'm going to try to qualify for the boston marathon while there. The qualifying time is 3:10:59 which means I'll have to run about 7:15 miles for 26.2 miles (!!).
by Excalibur0998
Sat Dec 13, 2008 7:50 am UTC
Forum: Mathematics
Topic: Impressing my friends
Replies: 5
Views: 1277

Impressing my friends

Someone once showed me a pretty dumb game. You take a deck of cards and guess what the color of the next card is. If you're right you get to keep the card and guess again, but if you're wrong then you have to give the card back and it goes on the bottom of the deck. Usually people get up to about 6-...
by Excalibur0998
Wed Sep 24, 2008 4:56 am UTC
Forum: Mathematics
Topic: Frustum
Replies: 13
Views: 2145

Re: Conic Frustum

ps. You probably shouldn't post your engineering homework on a forum that shows up as the second entry when you Google "conic frustum" Now that it's already past the due date, I don't feel too bad about posting this, however. // Haha, I was thinking the same thing. I wonder if the OP goes...

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