User A New Guy - Mathematics Stack Exchange

bio	website
	location
	age
visits	member for	8 months
	seen	May 3 at 4:23
stats	profile views	569

	245 reputation	bio	website		visits	member for	8 months
113 badges		location			seen	May 3 at 4:23

10

16

votes

2

answers

365

views

Is there a step by step checklist to check if a multivariable limit exists and find its value?

mar 5 at 5:11 Stahl 3,617

3

9

votes

2

answers

226

views

Check my workings: Prove the limit $\lim\limits_{x\to -2} (3x^2+4x-2)=2 $ using the $\epsilon,\delta$ definition.

homework limit proof-writing definition solution-verification

may 9 at 13:04 Martin Sleziak 20.3k

2

4

votes

3

answers

127

views

Is there a faster way to do this? Find an orthogonal matrix $P$ and a diagonal matrix $D$ such that $A=PDP^T$

homework linear-algebra

nov 21 at 19:02 user1551 16.7k

4

votes

3

answers

75

views

Is this proof correct? To prove $F(A)\cap F(B)\subseteq F(A\cap B) $ for all functions $F$.

homework functions

oct 30 at 17:05 Mathematics 1,463

4

votes

3

answers

353

views

Evaluate the following integral, $\int\sqrt{4-\sqrt{x}}dx$

homework integral

oct 29 at 13:51 Kamal Hajjaj Isa 37

1

4

votes

4

answers

268

views

Find the following limit, $\lim_{x\to {\infty}} x\ln((x+1)/(x-1))$

homework limit

oct 24 at 18:24 Gottfried Helms 7,197

3

votes

4

answers

259

views

Find the following limit $\lim_{x\to 0}\frac{\sqrt[3]{1+x}-1}{x}$

homework calculus limit

may 2 at 19:41 Andy 1,230

3

votes

3

answers

85

views

Show that if A is invertible, then $Au_1,Au_2,\ldots, Au_k$ are linearly independent.

homework linear-algebra

mar 31 at 6:18 Community♦ 1

3

votes

2

answers

3

kviews

Deal 4 cards from a deck. What is the probability that we get one card from each suit?

homework probability

mar 1 at 11:06 Mohit 1

1

3

votes

3

answers

86

views

Show that there is a non-zero constant $a$ such that $T_1(v)=aT_2(v)$ for all $v\in R^n$

homework linear-algebra

nov 21 at 18:25 Mercy 4,470

3

votes

3

answers

99

views

Modulo Congruence: How does $a=b\bmod n$ implies $a$ and $b$ have the same remainder when divided by $n$?

elementary-number-theory

nov 12 at 1:32 alejopelaez 951

1

3

votes

2

answers

120

views

Linear algebra : Homework. Show that there exists $n+1$ vectors $u_1,u_2,…,u_n,u_{n+1}$

homework linear-algebra

oct 20 at 6:03 Josh Keneda 276

3

votes

2

answers

2

kviews

Prove that the derivative of an even differentiable function is odd, and the derivative of an odd is even.

limit derivatives

sep 28 at 12:44 Avatar 8,345

3

votes

6

answers

477

views

Proving that $x^3 +1=15x$ has at most three solutions. in the interval [-4,4].

proof-strategy

sep 28 at 2:36 alex.jordan 8,814

2

votes

4

answers

690

views

Check my workings: Show that $\lim_{h\to0}\frac{f(x+h)-2f(x)+f(x-h)}{h^2}=f''(x)$

homework calculus limit derivatives

feb 20 at 20:59 Mhenni Benghorbal 14k

2

votes

2

answers

100

views

Is this statement “Every element in the empty set is greater than itself.” true or its negation is true?

homework elementary-set-theory logic

nov 26 at 13:10 Dan Christensen 1,575

2

votes

2

answers

95

views

Show that the function $g(x)=x^4+x^3+1$ is one-to-one on $[0,2]$

homework functions

oct 29 at 15:16 EuYu 15.3k

2

votes

2

answers

106

views

How do I integrate the indefinite integral, $\frac {\sin t}{t+1}$ w.r.t to t.

homework calculus integral

oct 27 at 14:44 Martin Gales 1,262

1

2

votes

1

answer

66

views

Question about variance and its relation to standard deviation

statistics

oct 19 at 5:56 Veeggon 36

2

votes

3

answers

505

views

Show that the equation $x^3 +1 = 15x$ has three solutions in the interval $[-4,4]$

limit

sep 27 at 5:28 Brian M. Scott 154k

2

votes

5

answers

272

views

Find $\lim_{x\to 0} \cos \big(\pi x^2 \csc (\frac {x} {2}) \cot (6x) \big) $

limit

sep 27 at 5:06 Alfred Chern 922

2

votes

2

answers

216

views

Determine the value of $k$, if any, that makes k continuous everywhere for this piece wise function.

calculus limit continuity

sep 25 at 16:52 Avatar 8,345

1

vote

1

answer

43

views

Homework: A park contains 4 loving couples. 3 people are randomly selected. The chance of picking a couple amongst the 3 is…

homework probability

feb 26 at 9:18 bryansis2010 1,614

1

vote

2

answers

677

views

Assume you toss a fair coin 25 times. How many completed runs do you expect to observe?

homework probability

nov 15 at 8:52 Henry 32.1k

1

vote

1

answer

29

views

Let $A=\{6,10,30\},B=\{3,5\}$ and $P(x,y)=$ $x$ is divisible by $y$. Are these statements true?

homework elementary-number-theory

nov 15 at 8:12 Berci 20.7k

1

vote

5

answers

97

views

Find the length of the curve $x=0.5y\sqrt{y^2-1}-0.5\ln(y+\sqrt{y^2-1})$ from y=1 to y=2.

homework calculus

nov 11 at 14:25 Daniel Littlewood 2,638

1

vote

1

answer

76

views

Find the following limits. $\lim_{x\to e^+} (\ln x)^{\frac{1}{x-e}}$

homework limit

nov 8 at 13:21 ncmathsadist 17.2k

1

vote

3

answers

203

views

For $a<b$, $\int_{a}^{b}f(x)dx=0$. Prove that there is at least one number in $(a,b)$ such that $f(c)=0$.

homework integral

oct 30 at 19:10 Mhenni Benghorbal 14k

1

vote

2

answers

105

views

How do we show that this particular function is not well defined?

homework functions

oct 30 at 15:56 Brian M. Scott 154k

1

vote

2

answers

347

views

Find the limit by expressing it as a definite integral of an appropiate function via Riemann Sums.

homework integral limit summation

oct 24 at 18:06 Babak S. 27.8k

A New Guy

64 Questions