User jnm2 - Mathematics Stack Exchange

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	1,068 reputation	bio	website		visits	member for	2 years, 5 months
1515 badges		location	United States		seen	Jan 19 at 23:38

33

49

votes

3

answers

63

kviews

Teenager solves Newton dynamics problem - where is the paper?

jun 8 '12 at 15:58 Américo Tavares 21.4k

11

votes

8

answers

2

kviews

How to calculate $e^x$ with a standard calculator

numerical-methods approximation exponentiation calculator

may 31 at 8:52 wendy.krieger 493

3

10

votes

4

answers

310

views

Finding the power series for $y$ where $y + \sin(y) = x$

sequences-and-series power-series

may 30 '12 at 13:19 jnm2 1,068

8

votes

2

answers

474

views

Are there other kinds of bump functions than $e^\frac1{x^2-1}$?

functions big-list

jan 23 '12 at 13:14 jnm2 1,068

2

7

votes

3

answers

465

views

How to calculate $f(x)$ in $f(f(x)) = e^x$?

power-series functional-equations tetration

dec 9 at 16:05 Anixx 985

7

votes

2

answers

219

views

Is the use of $\lfloor x\rfloor$ legitimate to correct discontinuities?

calculus trigonometry functions

jul 17 '12 at 6:27 Ｊ. M. 39.9k

1

7

votes

1

answer

402

views

Integral and derivative of $\lfloor x\rfloor$ and $x - \lfloor x\rfloor$

calculus

sep 10 '11 at 15:28 Ｊ. M. 39.9k

2

6

votes

3

answers

346

views

Parametric form of an ellipse given by $ax^2 + by^2 + cxy = d$

analytic-geometry conic-sections

oct 6 '11 at 11:19 Ｊ. M. 39.9k

4

5

votes

2

answers

317

views

How to solve differential equations of the form $f'(x) = f(x + a)$

differential-equations

oct 21 '11 at 15:14 jnm2 1,068

2

5

votes

2

answers

158

views

Efficient way to find $a$ in $c = 6a\mod n$

modular-arithmetic

jun 16 '11 at 19:38 Community♦ 1

4

votes

1

answer

114

views

Triangular periodic tessellation in two variables

periodic-functions

jan 23 '12 at 7:14 joriki 93.6k

2

4

votes

0

answers

138

views

How to solve a differential equation associated with square wheels?

differential-equations

oct 21 '11 at 16:16 Ｊ. M. 39.9k

3

votes

2

answers

128

views

Is $\lfloor x\rfloor$ defined in terms of $|x|$ and branch selection?

algebra-precalculus

sep 10 '11 at 22:58 Srivatsan 15.7k

2

votes

0

answers

129

views

Reversing a roulette on a straight line - solving for a parameterization?

differential-geometry plane-curves

apr 14 '12 at 11:26 Ｊ. M. 39.9k

2

votes

4

answers

663

views

Parametric equation for a plane perpendicular to a vector

analytic-geometry

jan 7 '12 at 0:28 Community♦ 1

2

votes

1

answer

304

views

Integrating the inverse square law, $\ln$ vs $\tan^{-1}$ - domain issue?

calculus differential-equations physics

dec 15 '11 at 21:52 jnm2 1,068

2

votes

1

answer

164

views

How do I determine the measure for a volume integral?

integral multivariable-calculus

nov 6 '11 at 0:41 Ｊ. M. 39.9k

2

votes

2

answers

152

views

How to solve a quadratic in $\sin(t)$ and $\cos(t)$

trigonometry

oct 13 '11 at 23:03 Ｊ. M. 39.9k

1

2

votes

0

answers

120

views

Is there software that interpolates/extrapolates data using a discrete Fourier?

fourier-analysis math-software interpolation extrapolation

sep 7 '11 at 2:48 Ｊ. M. 39.9k

2

votes

1

answer

78

views

How can I calculate $a$, $f$, $x_0$ and $y_0$ in $y = a \cos(f(x - x_0)) + y_0$ given four arbitrary points?

trigonometry

aug 23 '11 at 3:52 Ｊ. M. 39.9k

1

2

votes

1

answer

106

views

Is there a way to solve for $x$ in $\cos(ax)/\cos(bx)=c$?

trigonometry

aug 22 '11 at 15:29 zyx 12k

2

votes

1

answer

114

views

Is there a way to solve for $x$ in $\cos^{-1}(ax) / \cos^{-1}(bx) = c$?

trigonometry

aug 22 '11 at 5:47 zyx 12k

2

votes

1

answer

173

views

How many safe primes are there?

prime-numbers

jun 11 '11 at 17:20 André Nicolas 168k

2

1

vote

1

answer

193

views

Integral form of $\frac{dy}{dx} = \frac{d}{x} - \frac{x}{y}$

differential-equations

dec 17 at 2:49 doraemonpaul 1

1

vote

1

answer

224

views

Identity for complete elliptic integral of the second kind

special-functions elliptic-integrals

jul 13 '12 at 13:26 Ｊ. M. 39.9k

1

vote

2

answers

165

views

Integral for an inverse with no closed-form solution

calculus

feb 19 '12 at 3:45 Peter Tamaroff 28.8k

1

vote

1

answer

150

views

Is there a solution for $y\sqrt{y^2 + 1} + \sinh^{-1}(y) = x$?

algebra-precalculus

nov 6 '11 at 7:59 Martin Sleziak 20.8k

1

vote

2

answers

206

views

Distance estimation to an implicit function graph

graphing-functions

aug 22 '11 at 17:21 jnm2 1,068

1

vote

1

answer

128

views

Why does $q \equiv (r-1)/2 \mod r$ mean that $2q \equiv -1 \mod r$?

prime-numbers modular-arithmetic

jun 14 '11 at 15:59 FUZxxl 1,320

0

votes

1

answer

179

views

Line-line intersection derivation

analytic-geometry

oct 7 '11 at 14:02 Sasha 41.6k

jnm2

32 Questions