Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Guestbook » feelings about common core » 2014-12-18 09:33:03

I think it is a terrible way to promote the more "liberal arts type" education. It was the primary reason as to why I decided not to even apply to Chicago or Columbia.

#2 Re: Coder's Corner » Coding » 2014-12-18 08:53:38

ShivamS wrote:

What languages do you guys code in? As for me: BASIC, JB(Just Basic), RB (RunBasic), VB (Visual Basic), COBOL, FoxPro, Liberty Basic (LB), Python, C#, C, C++ and Java. That was compiler and IDE based. As for web: HTML (no duh!), CSS (no duh x2! (not factorial)), PHP,, JS, Ajax and Flash. I am fluent in most so...

It is funny how in the past 2 years, I have almost exclusively been using MATLAB, Mathematica, C++ and Fortran (also somewhat Java and Python, although I'm getting less and less impressed with the scientific computing abilities of those two languages, although Python isn't too bad). Obviously that led me to forget the specific details of most of the other languages, except C and PHP (at least I think).

#3 Re: Guestbook » Merry Christmas » 2014-12-16 12:45:06

If you're looking for problems, Project Euler is a very good site (although you must know programming for most of the problems).

#4 Re: Guestbook » Merry Christmas » 2014-12-16 12:13:54

Merry Christmas to you too.

#5 Re: Help Me ! » Factor Theorem » 2014-12-15 09:34:34

bob bundy wrote:

hi BonaviaFx

Don't want to join up to that, sorry.  Why not just tell me the name, exam board etc.  I'll find it from there.


You don't have to download a program, you can just download the file.

But anyway, here is another direct site: … 5/AM27.pdf

AM Syllabus (2015): Pure Mathematics

#6 Re: Introductions » Hi all you math fun lovers! » 2014-12-09 07:38:32

gmason972 wrote:

Hello Everybody!....I'm a little late to the forum party...but how is everybody doing?

Welcome to the forum!

#8 Re: Euler Avenue » Teach Chris » 2014-12-06 06:20:47

Chris2 wrote:

I only know graphing in two variables. Linear inequalities, slopes etc etc

A quadratic equation is in two variables. y = x^2 + x - 6

#10 Re: Guestbook » bobbym's messageboard » 2014-12-06 04:09:51

Agnishom wrote:

Now, since Shivam is here, I guess we could request him to explain the idea. He has probably tried working in that field too.

Which idea?

#11 Re: Guestbook » bobbym's messageboard » 2014-12-06 03:36:07

Chris2 wrote:

Physicist do not think they are god, most do not believe in god.

Actually, a survey conducted by APS showed that while theist physicists are in the minority, but not by much.

#12 Re: Euler Avenue » What had you learned today that you found interesting? » 2014-12-04 07:45:00

I learned a significant amount of things about Wilson loops today.

#13 Re: Euler Avenue » What had you learned today that you found interesting? » 2014-12-02 09:26:13

I learned about the collisionless Boltzmann equation and baryon asymmetry today (well, not for the first time, but more in detail).

#14 Re: Science HQ » When would the eight planets line up? » 2014-11-30 13:46:17

They never line up perfectly. Planetary alignment does occur but it usually is between 3 or so planets with a discrepancy of around 30 degrees. The last time all planets came in an alignment of 30 degrees was in, I believe, 500. The next time should be around 2800. Each such alignment occurs every 500 years and there is usually a 30% chance of it being aligned within 30 degrees.

#17 Re: Help Me ! » Interesting Optics Problem » 2014-11-27 12:48:43

sulley wrote:

Could you tell me where I can find more info on this SketchPad application please?

Geometer's Sketchpad:


#20 Re: Introductions » Hello » 2014-11-18 07:21:47

jd1000 wrote:

Hi there! smile Nice to meet you. I am new to this forum. Hello to everyone out there reading this message! I hope this forum is an excellent platform to express your views big_smile!

Welcome to the forum!

#21 Re: Maths Is Fun - Suggestions and Comments » Set Symbols » 2014-11-18 07:19:23

You might also want to include some symbols like the symmetric difference, relative complement and aleph-null.

MathsIsFun wrote:

Has anyone else seen I used for irrationals?

No, but neither have I seen "I" represent the "set of imaginary numbers".

bob bundy wrote:

There does not appear to be a regularly used symbol for the irrationals.

I believe the standard is R-Q. Q with a horizontal line on it, or R\Q.

#22 Re: Maths Is Fun - Suggestions and Comments » Set Symbols » 2014-11-17 13:32:39

I think you defined C and D but forgot A. Although you only use A in 1 example so you can just write D complement instead.

#24 Re: Introductions » Hello » 2014-11-13 06:27:22

Welcome to the forum!

#25 Re: Help Me ! » Is there such a function? » 2014-11-12 12:01:59

anonimnystefy wrote:

Does every non-constant periodic function have a smallest positive period?

Take the Dirichlet function for example.

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