Search found 441 matches

by tanvirab
Wed Dec 22, 2010 4:46 pm
Forum: Astronomy & Astrophysics
Topic: Weather Forecast
Replies: 8
Views: 3678

Re: Weather Forecast

They have weather predictions; but of course they are usually wrong. So, they have control centers from where they can control the probe/robot just like a remote controlled plane. I don't think there is any "biggest" problem. There are lots of small problems and engineering details, all of which nee...
by tanvirab
Wed Dec 22, 2010 3:09 am
Forum: Algebra
Topic: Inequlities defination.
Replies: 8
Views: 3363

Re: Inequlities defination.

$9R^2 \ge a^2+b^2+c^2$ and $9R^2 \nless a^2+b^2+c^2$ are the same. I am not sure what you mean by "definition" of the statements. The second part of your question is answered by the definition of real numbers. By definition, for any real number $a$ and $b$ either $a \leq b$ or $b \leq a$. So, at lea...
by tanvirab
Tue Dec 21, 2010 6:26 am
Forum: Physics
Topic: Dependance of "g"
Replies: 51
Views: 14811

Re: Dependance of "g"

If you change $m$ then $F$ also changes proportionately and thus $g$ remains unchanged.
by tanvirab
Tue Dec 21, 2010 3:18 am
Forum: Astronomy & Astrophysics
Topic: গ্রহ নক্ষএ
Replies: 25
Views: 18310

Re: গ্রহ নক্ষএ

Planet's are not part of stars and Earth was never part of the sun. A star system is formed from a gas cloud. When a part of the cloud becomes very dense, and collapses due to gravity and starts fusion, it becomes a star. Planets are formed from nearby (but different) regions of the cloud where the ...
by tanvirab
Mon Dec 20, 2010 6:06 pm
Forum: News / Announcements
Topic: Posting BDMO 2013 problems: ZERO tolerance!
Replies: 7
Views: 10718

Posting BDMO 2013 problems: ZERO tolerance!

Hi everyone; as you all know the divisional olympiads have started. Good luck to all participants. Please carefully note that it is forbidden to discuss any problems from the divisional Olympiads of this year before January 25, 2012. Doing so will disqualify you from BDMO and ban you from the forum....
by tanvirab
Mon Dec 20, 2010 6:05 pm
Forum: Higher Secondary Level
Topic: Matrix
Replies: 13
Views: 5204

Re: Matrix

এইটা কি transpose এর বাংলা? আগে কখনো শুনি নাই। কই পাইলা?

যাই হোক, আমি জানতে চাইসিলাম, transpose এর সংজ্ঞা।
by tanvirab
Mon Dec 20, 2010 3:06 pm
Forum: Social Lounge
Topic: Favorite problem/theorem
Replies: 12
Views: 4765

Re: Favorite problem/theorem

ওহ! ফার্মার শেষ উপপাদ্য। যদিও জিনিসটা মোটামুটি উপযোগহীন; কিন্তু পৃথিবীর গণিতবিদদের শতাধিক বছর ধইরা ভুগাইতে পারসে।
by tanvirab
Mon Dec 20, 2010 2:17 am
Forum: Introductions
Topic: Introduction
Replies: 2
Views: 1617

Re: Introduction

স্বাগতম। আশা করি ফোরাম তোমার কাজে লাগবে।
by tanvirab
Mon Dec 20, 2010 2:15 am
Forum: Higher Secondary Level
Topic: Matrix
Replies: 13
Views: 5204

Re: Matrix

$A$ and $A^T$ are not the same.
Let's go step by step. What is your definition of transpose matrix?
by tanvirab
Sun Dec 19, 2010 4:31 am
Forum: Geometry
Topic: Silly Questions
Replies: 2
Views: 1759

Re: Silly Questions

Euclidean geometry is plane geometry. There is no such thing as Euclidean proof.