User M_B

7 votes

How can we define the limit of a constant function?

answered Sep 19, 2018 at 2:33

4 votes

Good books on complex numbers

answered Jun 22, 2017 at 3:12

3 votes

Why $\sin\left( \frac 1 x \right) $ oscillates infinitely many times as $x \to 0$

answered Jun 28, 2017 at 5:09

3 votes

What is the purpose of a function being surjective?

answered Jun 16, 2017 at 0:10

3 votes

How to calculate limit as x approaches infinity of a^x/b^x?

answered Jun 14, 2017 at 20:57

2 votes

Clarification on proof for the product form of a sum on a completely multiplicative function

answered Jun 14, 2017 at 2:15

2 votes

Is the intersection of these given sequences the empty set?

answered Sep 20, 2018 at 1:12

1 vote

Accepted

How to tell a dimension of a subspace

answered Jun 29, 2017 at 1:45

1 vote

sum (difference) of polynomials to the power n

answered Apr 8, 2018 at 21:28

1 vote

What does "min" mean?

answered Jun 14, 2017 at 16:19

1 vote

Unconnected sets.

answered Jun 15, 2017 at 2:45

1 vote

Describe Mathematically and graphically the region represented by $\ -\pi \lt arg (z) \lt \pi $

answered Jun 17, 2017 at 21:00

0 votes

Closure of an open set

answered Jun 29, 2017 at 1:09

0 votes

Trigonometric Equation : $\sin 96^\circ \sin 12^\circ \sin x = \sin 18^\circ \sin 42^\circ \sin (12^\circ -x)$

answered Jun 15, 2017 at 23:55

0 votes

Accepted

How to prove the following.

answered Apr 8, 2018 at 21:09

0 votes

How to prove that if a function $f$ from a finite set $X$ to $X$ is surjective, then $f$ is injective.

answered Sep 23, 2018 at 4:37

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16 Answers

How can we define the limit of a constant function?

Good books on complex numbers

Why $\sin\left( \frac 1 x \right) $ oscillates infinitely many times as $x \to 0$

What is the purpose of a function being surjective?

How to calculate limit as x approaches infinity of a^x/b^x?

Clarification on proof for the product form of a sum on a completely multiplicative function

Is the intersection of these given sequences the empty set?

How to tell a dimension of a subspace

sum (difference) of polynomials to the power n

What does "min" mean?

Unconnected sets.

Describe Mathematically and graphically the region represented by $\ -\pi \lt arg (z) \lt \pi $

Closure of an open set

Trigonometric Equation : $\sin 96^\circ \sin 12^\circ \sin x = \sin 18^\circ \sin 42^\circ \sin (12^\circ -x)$

How to prove the following.

How to prove that if a function $f$ from a finite set $X$ to $X$ is surjective, then $f$ is injective.