Math Is Fun Forum

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

You are not logged in.

#126 Re: Exercises » Question on the square rooth of polynomials » 2013-08-20 12:33:55

bobbym wrote:

We could take that square root but it just would not be a polynomial.

Yes, but that's what I find weird... I don't see the logic behind it. But if it's the way it is, to play the game of mathematics, then we have to consider it that way.

#127 Re: Exercises » Question on the square rooth of polynomials » 2013-08-20 11:29:53

Mmmh... Okay. I just find it weird that we can't take the square rooth even if it doesn't have a number (two in this case) raised as a power...

#128 Re: Help Me ! » Geometry. » 2013-08-20 10:08:09

We have the 3 geometric figures : A,B,C
With the information given: A congruent to B, B congruent to C

So, inversely, we will have :

B congruent to A, because A is congruent to B, so, its inverse must necessarely also be true, because if it wasn't we would a contradiction with the information given to us that A congruent B, but we know that it isn't the case, so the only option left is B is really congruent to A

C congruent to B
For the same reason has the above statement.

So, we have 3 geomtric figures congruent, because A is congruent to B, and having proved the inverse of B congruent C, that is, C congruent to B, we see that the two geometric figures are also congruent to the same figure (B), and that...

A is congruent to C

#129 Exercises » Question on the square rooth of polynomials » 2013-08-20 09:36:38

Al-Allo
Replies: 5

Hi : http://img841.imageshack.us/img841/9800/hviw.png

I was wondering, I undestand what the text in the given link says, but I don't understand why we don't consider square rooth of variables valid?

It says that a polynomials can only be constructed with addition, divison and substraction. The square rooth of two is a number, like any other, which can be used to construct a polynomial with these basic operation. Why can't we consider it in the same manner with square rooths of variables ????

Thank you.

#130 Help Me ! » Geometry. » 2013-08-20 07:07:56

Al-Allo
Replies: 8

Show that if a geometric figure is congruent to another geometric figure, which is in its turn congruent to a third geomtric figure, then the first geometric figure is congruent to the third.

We have the 3 geometric figures : A,B,C
With the information given: A congruent to B, B congruent to C

So, inversely, we will have :

B congruent to A, because A is congruent to B, so, its inverse must necessarely also be true, because if it wasn't we would a contradiction with the information given to us that A congruent B, but we know that it isn't the case, so the only option left is B is really congruent to A

C congruent to B
For the same reason has the above statement.

So, we have 3 geomtric figures congruent, because A is congruent to B, and having proved the inverse of B congruent C, that is, C congruent to B, we see that the two geometric figures(A and C) are also congruent to the same figure (B), and that...

A is congruent to C

#131 Re: Help Me ! » Geometry questions » 2013-08-19 04:33:25

ok Thank you for your help ! It was great !

#132 Re: Help Me ! » Geometry questions » 2013-08-19 04:30:57

But for the semi-cylinder, you didn't count the rectangle ????

#133 Re: Help Me ! » Geometry questions » 2013-08-19 04:06:37

Yes, I copied the question word for word

#134 Re: Help Me ! » Geometry questions » 2013-08-19 03:55:40

Well, it's originaly a russian book, but it's in english. (If I understood correctly your question?)

#135 Re: Help Me ! » Geometry questions » 2013-08-19 03:30:17

ok, so i've got half a cylinder. which is composed of two half a circle and one rectangle.

half a cone which is composed of one triangle and half a circle

and half a sphere with only one circle

is this it ??

#136 Re: Help Me ! » Geometry questions » 2013-08-19 03:22:36

Well yes that's it. If we decompose it, we get 3 surfaces.

#137 Re: Help Me ! » Geometry questions » 2013-08-19 03:10:56

Two: cone

three: Cylinder


Four: Pyramid with triangular base

I thought also for the first one half a sphere, if we only count it's base but not its lateral surface.. (Because im not sure if the lateral face of a sphere is a plane or not...)

#138 Help Me ! » Geometry questions » 2013-08-18 11:29:15

Al-Allo
Replies: 14

Give examples of geometric solids bounded by one, two ,three , four planes (or parts of planes)

I only need help with the 1 plane one.

I'm not sure of it but the only one I can come with is a sphere. I know that it's surface isn't flat( the question doesn't mention that it needs to be flat) , or I'm not even sure that it's composed of a plane since it can't be decomposed.
SO my real question would be : Can we consider the sphere composed of only 1 plane or not ? Even if we can't decompose it ?
Any suggestions ?


I don't want the answer to the question, just hints-suggestions. Thank you

#139 Re: Help Me ! » Definition question » 2013-08-16 05:34:59

The trivial and non trivial factors...

#140 Re: Help Me ! » Definition question » 2013-08-16 05:05:39

Ok, and what is the purpose of it ?

#141 Help Me ! » Definition question » 2013-08-16 05:01:57

Al-Allo
Replies: 5

Can somebody tell me what are non trivial factors ?

Thanks

#142 Re: Help Me ! » quick logic question » 2013-08-11 04:29:54

I don't think the problem was meant to be that complicated lol But it's good to try, and like bobbym said, wait for more people to answer.

#143 Re: Help Me ! » quick logic question » 2013-08-11 01:21:08

Good ! Sadly i don't have the solution ^^

#144 Re: Help Me ! » quick logic question » 2013-08-11 01:15:05

Ah ok.

Wait you mean from me or other members?

#145 Help Me ! » quick logic question » 2013-08-11 01:03:38

Al-Allo
Replies: 7

Are the father of the son of NN and the son of the father of NN the same person ?

i say yes, and it's NN. Am i right ???


NN                                 Father

Son                                 NN

This how I imagined it. thanks

#146 Re: Exercises » Euclid's proof of infinitude of primes. » 2013-08-09 06:12:54

ok, anyway, ill be going, if i have any other question, they will be here ! thank you for your support

#148 Re: Exercises » Euclid's proof of infinitude of primes. » 2013-08-09 05:56:18

In fact, I'm not in agreement with this. How can this be accepted ? WE have many odd numbers not primes.........

#149 Re: Exercises » Euclid's proof of infinitude of primes. » 2013-08-09 05:53:44

Mmmhh...it seems rather risky, don't you think ? It has a chance, but this is risky.

Board footer

Powered by FluxBB