User Nitin Uniyal

10 votes

Accepted

What is the rank of a $5 \times 5$ matrix $A$ if $A^{-1}$ exists?

answered Sep 21, 2016 at 7:58

7 votes

Explain why a line can never intersect a plane in exactly two points.

answered Jun 18, 2019 at 8:47

7 votes

Find values of $x$ so that the matrix is invertible

answered Jul 13, 2019 at 14:52

6 votes

If $x^2+2(\alpha-1)x-\alpha+7=0$ has distinct negative solutions...

answered Aug 12, 2022 at 22:52

6 votes

Residue of $e^{z+\frac1z}$ at $0$.

answered Jul 26, 2016 at 16:58

6 votes

Accepted

Determinant of odd matrix

answered Dec 30, 2016 at 11:27

5 votes

V.I. Arnold says Russian students can't solve this problem, but American students can -- why?

answered Jan 14, 2017 at 14:29

5 votes

Show that the square matrix A is invertible

answered Nov 10, 2016 at 3:55

5 votes

Rank of an Augmented matrix

answered Mar 7, 2016 at 15:38

5 votes

Accepted

Show $(a, b) \sim\Bbb R$ for any interval $(a, b)$

answered Aug 8, 2018 at 15:46

5 votes

Accepted

Problem regarding the Wronskian formula

answered Oct 14, 2019 at 1:22

4 votes

Verify whether a function is injective

answered Oct 6, 2019 at 10:39

4 votes

Accepted

$A$ and $A^2$ have same characteristic polynomial

answered Jul 13, 2019 at 2:58

4 votes

Graph Isomorphism for non-mathematician

answered Nov 30, 2015 at 6:08

4 votes

Type of singularity for $\tan(z)$ at $z = \frac{\pi}{2}$

answered Oct 5, 2016 at 16:24

4 votes

Probability of getting all faces of a die an equal number of times

answered Nov 1, 2016 at 14:44

3 votes

Are the plane and the third dimensional space homeomorphic?

answered Oct 26, 2016 at 13:37

3 votes

If $P$ and $Q$ are invertible matrices $PQ=-QP$, then which claim about their traces is true?

answered Dec 23, 2016 at 11:17

3 votes

Prove the following $x^2−y^2=(x−y)(x+y)$

answered Dec 29, 2016 at 4:27

3 votes

How to solve $\dfrac{\mathrm dx(t)}{\mathrm dt}=(2x(t)+6)(-2t^5+4t^4+2t^2)$ if $x(0)=-3$?

answered Dec 24, 2016 at 7:05

3 votes

What is the difference between non-reflexive or irreflexive?

answered Jan 10, 2017 at 8:24

3 votes

Accepted

Which of the following satisfies the equation $\phi(x)=f(x)+\int_{0}^{x}\sin(x-t)\phi(t)dt$

answered Apr 4, 2017 at 8:00

3 votes

Accepted

Universal and Existential quantifier in Propositional logic

answered Jul 1, 2016 at 7:50

3 votes

Show that every group of order $35$ is abelian.

answered Jun 24, 2016 at 2:16

3 votes

Straight Line Equation in Complex Plane

answered Jul 8, 2016 at 5:06

3 votes

convex region with 7 vertices

answered Jun 8, 2015 at 6:09

3 votes

If $f$ is an entire function and $f(z) \not \in [0,1]$ for every $z$, then $f$ is constant

answered Jun 5, 2019 at 1:23

3 votes

Why is a one-to-one linear map from a finite-dimensional vector space to itself onto?

answered Aug 6, 2018 at 4:24

3 votes

solution to system of equations

answered Aug 10, 2018 at 6:03

3 votes

How can I prove mathematically the reflection matrix has only the eigenvalues 1 or -1?

answered Oct 7, 2019 at 16:42

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631 Answers

What is the rank of a $5 \times 5$ matrix $A$ if $A^{-1}$ exists?

Explain why a line can never intersect a plane in exactly two points.

Find values of $x$ so that the matrix is invertible

If $x^2+2(\alpha-1)x-\alpha+7=0$ has distinct negative solutions...

Residue of $e^{z+\frac1z}$ at $0$.

Determinant of odd matrix

V.I. Arnold says Russian students can't solve this problem, but American students can -- why?

Show that the square matrix A is invertible

Rank of an Augmented matrix

Show $(a, b) \sim\Bbb R$ for any interval $(a, b)$

Problem regarding the Wronskian formula

Verify whether a function is injective

$A$ and $A^2$ have same characteristic polynomial

Graph Isomorphism for non-mathematician

Type of singularity for $\tan(z)$ at $z = \frac{\pi}{2}$

Probability of getting all faces of a die an equal number of times

Are the plane and the third dimensional space homeomorphic?

If $P$ and $Q$ are invertible matrices $PQ=-QP$, then which claim about their traces is true?

Prove the following $x^2−y^2=(x−y)(x+y)$

How to solve $\dfrac{\mathrm dx(t)}{\mathrm dt}=(2x(t)+6)(-2t^5+4t^4+2t^2)$ if $x(0)=-3$?

What is the difference between non-reflexive or irreflexive?

Which of the following satisfies the equation $\phi(x)=f(x)+\int_{0}^{x}\sin(x-t)\phi(t)dt$

Universal and Existential quantifier in Propositional logic

Show that every group of order $35$ is abelian.

Straight Line Equation in Complex Plane

convex region with 7 vertices

If $f$ is an entire function and $f(z) \not \in [0,1]$ for every $z$, then $f$ is constant

Why is a one-to-one linear map from a finite-dimensional vector space to itself onto?

solution to system of equations

How can I prove mathematically the reflection matrix has only the eigenvalues 1 or -1?