User MathAdam

9

26

votes

2

answers

618

views

Is this a valid proof that the harmonic series diverges?

Mar 25 at 3:56 Dr. Michael W. Ecker 163

3

10

votes

3

answers

2k

views

Can a function have a derivative where it has no value?

calculus real-analysis

Apr 22 '18 at 10:49 ClassicEndingMusic 713

8

votes

3

answers

632

views

Does $\lim_{x\to 0^+} \sqrt{x}$ exist or not?

limits radicals

Sep 9 '18 at 11:20 Dan Sheppard 340

6

8

votes

4

answers

3k

views

Is there a relationship between vector spaces and fields/rings/groups?

linear-algebra group-theory ring-theory vector-spaces field-theory

Sep 7 '15 at 18:45 Community♦ 1

3

7

votes

2

answers

228

views

Is this a sound demonstration of Euler's identity?

proof-verification complex-numbers polar-coordinates

Oct 12 '15 at 8:13 MathAdam 3,007

1

6

votes

1

answer

145

views

How do I translate $ [(P \Rightarrow Q) \land (Q \Rightarrow T)] \Rightarrow T$ into English?

propositional-calculus

Mar 27 at 22:52 nph 151

1

5

votes

0

answers

608

views

Does the arithmetic derivative have a geometric interpretation

elementary-number-theory prime-numbers

Dec 22 '18 at 21:48 MathAdam 3,007

1

5

votes

2

answers

135

views

Please help me to remove Feynman's $\log_{10}$ from my eye.

logarithms

Dec 1 '17 at 23:31 Martin Argerami 161k

1

4

votes

2

answers

615

views

Can we solve this without cubic formula?

algebra-precalculus cubic-equations

Jan 11 '18 at 21:19 MathAdam 3,007

4

votes

2

answers

113

views

How do I demonstrate the geometric meaning of a $2\times2$ matrix?

linear-algebra

Sep 7 '15 at 5:02 MathAdam 3,007

3

votes

1

answer

80

views

Does this infinite nested radical show that $\pi$ is irrational?

notation pi nested-radicals

Apr 23 at 8:06 Community♦ 1

3

votes

1

answer

2k

views

Why does Desmos give a different exponential regression than my TI 84 and my Calculus text?

calculator regression-analysis

Nov 26 '18 at 4:23 MathAdam 3,007

3

votes

4

answers

583

views

Does a Dedekind cut define a real number into existence?

real-numbers

Oct 2 '18 at 7:15 Henno Brandsma 184k

3

votes

3

answers

14k

views

If a function is undefined at a point, is it also discontinuous at that point?

real-analysis functions continuity

May 19 '18 at 16:15 Daniel R. Collins 7,172

3

votes

2

answers

158

views

A right triangle has leg $n$, hypotenuse $2n+6$, and perimeter $60$. Find the lengths of all sides.

quadratics

Jun 2 '17 at 13:21 MathAdam 3,007

3

votes

1

answer

64

views

How does $y=\frac{2x+2}{x+2}$ contribute to demonstrating the Dedekind cut for $\sqrt{2}$?

real-numbers

May 2 '17 at 0:14 MathAdam 3,007

2

votes

4

answers

129

views

Is this approach to the limit solution kosher?$ \lim_{n\rightarrow\infty}\frac{(n!)^{\tfrac{1}{n}}}{n}=\frac{1}{e}$

limits solution-verification limits-without-lhopital

Nov 7 at 22:54 Community♦ 1

2

votes

5

answers

48

views

Is there anything in the proof for $\frac{a}{1-r}$ to show that it won't work for $|r|\gt1$ when summing an infinite geometric series?

sequences-and-series convergence-divergence geometric-series

Feb 24 '18 at 23:48 Sri-Amirthan Theivendran 28.9k

2

votes

3

answers

102

views

Is $\emptyset$ a set element?

elementary-set-theory

Apr 24 '17 at 1:25 zwim 19.5k

2

votes

7

answers

1k

views

Is the $\epsilon-\delta$ definition of a limit useful for either calculating or proving limits?

limits epsilon-delta limits-without-lhopital

Sep 13 '15 at 0:39 Community♦ 1

1

vote

2

answers

129

views

Fibonacci general term: How do I mend this broken derivation?

power-series generating-functions fibonacci-numbers negative-binomial

Sep 7 at 3:49 heropup 90.5k

1

vote

1

answer

26

views

Can a transcendental function generally be expressed as a polynomial of $n^{th}$ degree where $n$ approaches infinity?

polynomials roots infinite-product transcendental-functions

Nov 30 '19 at 18:18 Matt Samuel 54.1k

1

vote

1

answer

157

views

Are there any counterexamples to a generalized Goldbach conjecture?

prime-numbers goldbachs-conjecture

Feb 22 '19 at 7:10 J. W. Tanner 53.6k

1

vote

1

answer

55

views

How to solve this vector problem involving more than one unknown?

algebra-precalculus trigonometry euclidean-geometry physics

Jan 20 '19 at 6:39 MathAdam 3,007

1

vote

2

answers

58

views

What (if any) system of equations would solve this problem?

algebra-precalculus

Dec 20 '18 at 8:38 Yves Daoust 192k

1

vote

0

answers

57

views

Is there any way to rescue this trig identity proof?

trigonometry

Dec 19 '18 at 13:03 ThatOneNerdyBoy 115

1

vote

2

answers

228

views

What is the significance of the number $0.739085133$ (the solution of $x = \cos(x)$)?

trigonometry

Apr 26 '18 at 3:44 Claude Leibovici 178k

1

vote

3

answers

106

views

Is there a general solution to $a^x + b^x =c^x$ for $x\in\mathbb{R}$?

functions puzzle

May 5 '17 at 0:10 Tob Ernack 3,319

1

vote

1

answer

920

views

Please help us diagram this trig problem.

trigonometry

May 13 '16 at 5:21 user338955 152

1

vote

0

answers

87

views

How to formulate a linear programming model where the rates of production must be calculated?

inequality optimization linear-programming constraint-programming

Oct 16 '15 at 5:17 MathAdam 3,007

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42 Questions

Is this a valid proof that the harmonic series diverges?

Can a function have a derivative where it has no value?

Does $\lim_{x\to 0^+} \sqrt{x}$ exist or not?

Is there a relationship between vector spaces and fields/rings/groups?

Is this a sound demonstration of Euler's identity?

How do I translate $ [(P \Rightarrow Q) \land (Q \Rightarrow T)] \Rightarrow T$ into English?

Does the arithmetic derivative have a geometric interpretation

Please help me to remove Feynman's $\log_{10}$ from my eye.

Can we solve this without cubic formula?

How do I demonstrate the geometric meaning of a $2\times2$ matrix?

Does this infinite nested radical show that $\pi$ is irrational?

Why does Desmos give a different exponential regression than my TI 84 and my Calculus text?

Does a Dedekind cut define a real number into existence?

If a function is undefined at a point, is it also discontinuous at that point?

A right triangle has leg $n$, hypotenuse $2n+6$, and perimeter $60$. Find the lengths of all sides.

How does $y=\frac{2x+2}{x+2}$ contribute to demonstrating the Dedekind cut for $\sqrt{2}$?

Is this approach to the limit solution kosher?$ \lim_{n\rightarrow\infty}\frac{(n!)^{\tfrac{1}{n}}}{n}=\frac{1}{e}$

Is there anything in the proof for $\frac{a}{1-r}$ to show that it won't work for $|r|\gt1$ when summing an infinite geometric series?

Is $\emptyset$ a set element?

Is the $\epsilon-\delta$ definition of a limit useful for either calculating or proving limits?

Fibonacci general term: How do I mend this broken derivation?

Can a transcendental function generally be expressed as a polynomial of $n^{th}$ degree where $n$ approaches infinity?

Are there any counterexamples to a generalized Goldbach conjecture?

How to solve this vector problem involving more than one unknown?

What (if any) system of equations would solve this problem?

Is there any way to rescue this trig identity proof?

What is the significance of the number $0.739085133$ (the solution of $x = \cos(x)$)?

Is there a general solution to $a^x + b^x =c^x$ for $x\in\mathbb{R}$?

Please help us diagram this trig problem.

How to formulate a linear programming model where the rates of production must be calculated?