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Mathematics : Recent Questions and Answers (Page 21)

Find answers to your questions about Mathematics or help others by answering their Mathematics questions.

Existance and example of extraordinary set and set of all such extraordinary sets in the context of Russels paradox

I recently started studying elementary set theory on my own. I understood Russels paradox. By assuming set of all ordinary sets it leads to contradiction. Now if i think about...

Asked on 12/25/2021 by Nascimento de Cos

1 answer

Inverse of stereographic projection

I am trying to compute the inverse of $$f(theta,phi) = left(frac{costheta sinphi}{1-cosphi}, frac{sintheta sinphi}{1-cosphi}right)$$ but I lack some basic knowledge on how I can do that. Could please provide...

Asked on 12/25/2021 by Thoth

2 answer

Euclidean mapping question

Give $A$ is Euclidean domain and $delta: Asetminus left{0right} to mathbb{N}$ is Euclidean mapping. I have prove that "$A$ is a field if and only if ...

Asked on 12/25/2021 by Tung Nguyen

1 answer

Optimal guessing strategy in hangman word game?

Suppose we are playing the game hangman. My opponent picks a word at random from the dictionary, which we both have access to during the game. Once...

Asked on 12/25/2021 by zfj3ub94rf576hc4eegm

0 answer

If $f(x)=x^{2}$ and $g(x)=x sin x+cos x$; Find out the no of intersecting point

Question from an entrance paper If $f(x)=x^{2}$ and $g(x)=x sin x+cos x$ then A. $f$ and $g$ agree at no point B. $f$ and ...

Asked on 12/25/2021

4 answer

How to factor $x^k -1$?

Is there any way to find the degrees of the irreducible factors of a polynomial $x^k - 1$ over the field$Bbb F_q $, andover $Bbb Q$, in...

Asked on 12/25/2021 by Aspiring Mathematician

2 answer

Additional condition needed for a binary operation to have inverse, apart from the necessary condition of having a two-sided identity.

Is it needed that if two sided identity exists for a binary operation (on a set), still need to check if inverse exists or not. I request a reason for...

Asked on 12/25/2021 by jiten

1 answer

$Bbb{R}^n$ and $Bbb{R}$ are isomorphic as vector spaces over $Bbb{Q}$.

Show that $Bbb{R}^n$ and $Bbb{R}$ are isomorphic as vector spaces over $Bbb{Q}$.My attempt:Let $c=$ cardinality of $Bbb{R}$. Then we know that $Bbb{R}$ over ...

Asked on 12/25/2021 by user598858

2 answer

On k-regular functions

My father asked me the following question: A real function $fcolon mathbb{R}to mathbb{R}$ is called $k$-regular if for each $yin mathbb{R}$, the equation $f(x)=y$ has precisely...

Asked on 12/25/2021 by Mathematician 42

0 answer

Should I use the absolute value of a correlation coefficient?

I have calculated the Pearson correlation coefficient for two sets of values using excel. I got the value in the negative number. I know that the idea of getting a...

Asked on 12/25/2021 by LSG

0 answer

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