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#101 Re: Help Me ! » triangle inequality » 2013-05-28 12:39:38
In a triangle,a side must be smaller than the sum of other two sides,so the third side will be smaller than 16+21=37,which means there are 36 possible lengths.
#102 Re: Help Me ! » System of equations equivalent to the matrix equation » 2013-05-28 05:10:33
Yeah,that's correct.
#103 Re: Help Me ! » Just want to make sure I am doing this correctly » 2013-05-28 05:07:24
I'm confused,how can 1 by 3 and 1 by 3 matrices be multiplied?
#104 Re: Help Me ! » Pyramid volume » 2013-05-28 05:04:10
Thanks,is there any proof without calculus,i'm just curious.
#105 Re: Dark Discussions at Cafe Infinity » This man in purple....... » 2013-05-28 02:19:56
Hi,barbie,agnishom's talking about his avatar.
Agnishom,actually i just randomly assumed you were older.
#106 Help Me ! » Pyramid volume » 2013-05-27 23:32:54
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- Replies: 9
A isoceles triangle base pyramid's apex is on top of the triangle's top vertex,what is it's volume?is there a formula?how was it derived?
#107 Re: Dark Discussions at Cafe Infinity » This man in purple....... » 2013-05-27 17:50:59
O,ami mone korechilam tumi aro boro.
#109 Re: Dark Discussions at Cafe Infinity » This man in purple....... » 2013-05-27 02:52:58
Hi coder,yes,i was born in Dhaka,Bangladesh
Agnishom,ha,bujte perechi.
It's nice to meet bengali people here.
#110 Re: Dark Discussions at Cafe Infinity » This man in purple....... » 2013-05-26 18:05:01
Agnishom,you are a bengali?i am too, i live in bangladesh.
#111 Re: Help Me ! » What is this? » 2013-05-26 02:08:01
Thanks.
#112 Help Me ! » What is this? » 2013-05-25 23:46:51
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- Replies: 2
"in any circle a central angle is proportional to the arc it creates"-is this a postulate or proposition?
#113 Re: Help Me ! » Roots of an Equation » 2013-05-25 23:40:11
Bring cos x to left side and squre.
#114 Re: Dark Discussions at Cafe Infinity » What Is Your Favorite Food??????????? » 2013-05-25 19:56:52
My favourite food is air 
rj-world,you have to remember this is a forum not social network,the member names are earned when you have reached certain number of posts(except some)
#115 Re: Euler Avenue » Proof » 2013-05-25 18:02:15
If logic is the first concept,then the first proposition is of logic(even this assumption is made by logic)
#116 Re: Euler Avenue » Proof » 2013-05-25 17:59:33
I mean,lots of concepts depend on logic,i don't know if logic depends on other concepts
#117 Re: Euler Avenue » Proof » 2013-05-25 17:29:00
Every concept has a starting proposition,to prove this proposition you cannot use the concept since it doesn't have anything yet,after thinking a bit i saw that these starting propositions are proved using logical methods,that means every concept depends on logic.
#118 Re: Euler Avenue » Proof » 2013-05-25 13:10:55
So, you are saying these basic concepts are independent?
#119 Euler Avenue » Proof » 2013-05-25 01:09:51
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- Replies: 7
If someone were to write all the proofs in mathematics(logic,sets,numbers,geometry,groups etc)then what should he write first (as a proof is constructed on other proofs) ? What i mean is what is the absolutely first proof/proposition ?
#120 Re: Help Me ! » Piecewise function » 2013-05-24 19:17:02
Thanks
#121 Help Me ! » Piecewise function » 2013-05-24 15:40:40
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- Replies: 2
Can piecewise functions be differentiated?for example f(x)=2x for x<2,4 for x=2,x^2 for x>2,can f be differentiated?
#122 Re: Help Me ! » Simplifying Radical in Denominator » 2013-05-24 15:32:50
#123 Re: Help Me ! » Help me prove this » 2013-05-23 23:30:24
Thanks
#124 Re: Puzzles and Games » Make 9,999 using 9 nines » 2013-05-23 23:22:54
9999=min(9999,99999)