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

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#2 Re: Help Me ! » Letter-arranging » 2018-06-20 05:25:24

Is there any program for solving this? If yes, please provide the code.

bobbym used to be a pro at doing these with mathematica. But you can do that with any other language too, with some work.

#3 Re: Computer Math » Calculating Pi » 2018-06-20 05:23:55

In line 12, you are incrementing sone instead of stwo. Is this intentional?

#4 Re: Coder's Corner » String Permutations » 2018-06-20 05:19:57

Yes, it is definitely possible. You do it using recursion.

First, you try to answer the question, how do you do it if the string is empty. Then, you try to answer how to permute a string of length (n+1) if you knew how to permute a string of length n.

#5 Re: Coder's Corner » Calculating Complexity in C++ » 2018-06-20 05:15:45

Number of steps of what? As in number of instructions carried out by the CPU?

#6 Re: Computer Math » Mathematica Help » 2018-05-03 02:00:21

If I am not wrong, bobbym once recommended me [this](

I was also reading [this]( which seems pretty good.

#7 Re: Computer Math » [ASK] Math Type Expressions Got Messed Up » 2018-03-18 16:28:02

Instead of using Math Type, how about you start using LaTeX?

#8 Re: Jokes » Geek Jokes » 2018-03-18 16:00:22

These are pretty good!

#9 Re: Guestbook » Greetings » 2018-02-06 01:02:07

Greetings Natasha.

Do you like carrots?

#10 Re: Guestbook » Hi! » 2018-02-06 01:01:02

For the record, my calculator can deal with imaginary units. I call it WolframAlpha

#12 Dark Discussions at Cafe Infinity » CMI - (S.T.E.M.S) Scholastic Test of Excellence in Mathematcal Science » 2017-12-10 02:24:10

Replies: 0

Chennai Mathematical Institute (CMI), a premiere center for research and education in Mathematical Sciences, is organizing a nationwide (India) Mathematics, Physics and Computer Science Contest, the **S.T.E.M.S**, as a part of the college fest Tessellate.

The Olympiads will be held in the beginning of January. Registrations are open: [Link](


By participating in S.T.E.M.S, you get to show off your Mathematics/Physics/Computer Science skills at a national level. And have the chance to attend a Science Camp at CMI, where you'd meet some of the finest mathematicians and physicists in the country, not to mention the gifts.

The camp will feature some of the best Mathematicians, Physicists and Computer Scientists from some of the best research institutes in India, like CMI, ISI Bangalore, IMSc, IISc and the IIT's, etc. (The complete list of speakers shall be uploaded soon.) CMI shall provide travel fare, food and accomodation for the selected participants. Students from all age groups will have fair representation. It promises to be a great opportunity for the students to interact with CMI-ites and get an insight about college mathematics and college life(probably in that order, though). The camp shall also feature student talks from students of the aforementioned institutes. They shall also receive certificates signed by some of the best mathematicians of the country, books and other prizes. The top 100 participants shall receive certificates of participation.


#13 Re: Dark Discussions at Cafe Infinity » Math Is Fun featured on a blog » 2017-12-10 02:21:21

That is so cool. bobbym would have been very happy.

#14 Re: Computer Math » Geogebra: Why does sin() give the wrong value? » 2017-12-10 02:20:19

Actually, you can open settings and set Angle Units to Degree, if you want to.

#15 Re: Dark Discussions at Cafe Infinity » Idiosyncrasies » 2017-10-06 04:27:56

Hey! Nice list!

ii is a very good practice, keep it up!

iii) some people say that this is a sign of a rebel.

I share v with you.

viii) Nice! I do not really like Geography, though.

ix) Sometimes, that is me too.

x) I do that almost every day. It's not my favorite though.

I'd like to see bobbym's list, though

#16 Help Me ! » Are these two rings equal? » 2017-08-25 16:37:22

Replies: 1



1. Is

Or, simply, is there a polynomial

with rational coefficients such that

2. What if

is replaced with

#17 Re: Euler Avenue » What had you learned today that you found interesting? » 2017-08-11 22:53:02

I learnt that if an automaton with exactly n states accepts all strings of length n or less, then it accepts all strings.

#18 Re: Coder's Corner » In Search For Esoteric » 2017-08-11 22:51:17

How about a language called kannan-speak? The programs would read like how my algebra teacher teaches in the class.

Programs would begin with a recall. End with a joke. Variable declarations would read like "Notation: n in Integers". The program body would be divided into Lemmas and Theorems

#19 Re: Coder's Corner » In Search For Esoteric » 2017-08-01 14:51:58

Are you asking us about esoteric programming languages?

#20 Re: Jokes » Sans' Great Puns » 2017-07-28 14:14:01

Learning English can be hard. It can be taught through thorough thought, though.

#21 Re: Help Me ! » Functional Equation » 2017-07-25 13:52:36

Oh yes, that totally works. Thank you

#22 Help Me ! » Functional Equation » 2017-07-25 05:00:37

Replies: 2

Let f be a continuous function on the reals. Furthermore, assume that f is differential everywhere.

For all real x and y (such that y != 0), the following holds: f(x-y) = f(x)/f(y)

Assume that f'(0) = p

Can we use this to determine f?

#24 Re: This is Cool » More accurate than the Prime Number Theorem. » 2017-07-23 04:56:02

I don't think that is a substitute for the prime number theorem. The prime number theorem is an assymptotic bound. It can be calculated way faster than actually counting the primes

#25 Re: Computer Math » How a computer sees it. » 2017-07-21 06:00:28

Hey bobbym;

Here is a fun video about this.

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