Tagged Questions

-1
votes
0answers
51 views

f(x,y) [min/max] [closed]

I need to find a minima and maxima of a function z = x^2 - 12x + y^2 - 2y that is limited by points A(-7;-5); B(5;-5) and C(5;10) but i do not clearly understand the algorithm >&lt …
-3
votes
0answers
164 views

Your task is to carefully present this solution in the context of a detailed explanation of your work… [closed]

[closed] Your task is to carefully present this solution in the context of a detailed explanation of your work...
-2
votes
0answers
112 views

help with math homework, just need a push in right direction [closed]

sam is 22.If the amount that he invests is constant and if Sam wants his account to be worth $1,000,000 when he is 69 years old, how much should he invest each week? Assume that th …
0
votes
0answers
49 views

New differintegral formula: how is it related to other differintegral formulas?

Lets define new differintegral formula as $$\mathbb{D}^s_xf(x)= \sum_{m=0}^{\infty} \binom {s}m \sum_{k=0}^m\binom mk(-1)^{m-k}f^{(k)}(x)$$ or, equivalently, $$\mathbb{D}^s_xf(x …
0
votes
0answers
71 views

Two Series Questions [closed]

1) iF $f(x) = x^2 +x$, find the taylor series for f centered at a = 2. 2)what is the sum from 1 to infinity of $(.95)^n$ I got these questions wrong on my last test, and I'm not …
7
votes
3answers
463 views

Applications of visual calculus

Mamikon's visual calculus (see Mamikon, Tom Apostol, Wikipedia) is a very beautiful and surprisingly efficient tool. The basis is Mamikon's theorem. The area of a tangent swee …
0
votes
0answers
38 views

vector derivative of $\frac{VQ}{\|VQ\|_2^2}$ [closed]

Hi, I have trouble to compute the derivative in $V$ of: $ \frac{VQ}{\|VQ\|_2^2} $ where $V\in\mathbf{R}^{1,q}$ and $Q\in\mathbf{R}^{q,m}$
1
vote
1answer
187 views

Integral inequality for convex function

Let $u(x)$ be a smooth function from $\mathbb{R}$ to $\mathbb{R}$. Suppose that for some real numbers $a,b$ with $a < b$ the following equality is true: \begin{equation} \frac …
-1
votes
3answers
307 views

Can a nowhere continuous function be integrable ? [closed]

Let $f$ be a bounded function on a close interval, $[0,1]$ e.g.. Can it be everywhere discontinuous and integrable? Thanks! P.S. It isn't a homework for me and I asked this quest …
15
votes
9answers
2k views

Was the early calculus inconsistent?

This question does NOT concern the RIGOR, or lack thereof, of the early calculus. Rather the question is of its CONSISTENCY. George Berkeley wrote in 1734 with reference to the e …
4
votes
3answers
640 views

Does the derivative of log have a Dirac delta term?

Dirac writes down the following formula on page 61 of his "Principles of quantum mechanics": $\frac{d}{dx}\log x = \frac{1}{x} -i\pi\delta(x)$, see http://adsabs.harvard.edu/abs/19 …
1
vote
0answers
28 views

integral against a gaussian density over an increasing space

Consider the following gaussian denisity over $\mathbb{R}^{2^n}$ $$p_n(\underline{x}):=\frac{\exp(-\frac{1}{2n} < C_n^{-1}\underline{x},\underline{x} >)}{\sqrt{(2\pi n)^{2^n} \d …
1
vote
1answer
63 views

Approximating rational generating functions

Suppose we have a initial segment $x_1,\ldots,x_N$ (for reasonably large $N$) of a sequence of natural numbers $(x_i)$. We have reason to believe the generating function $\sum_{i=0 …
0
votes
1answer
121 views

Inequality of Partial Taylor Series

Hi, For a given $\theta < 1$, and $N$ a positive integer, I am trying to find an $x > 0$ (preferably the smallest such $x$) such that the following inequality holds: $$\sum_{k …
3
votes
0answers
435 views

Euler’s mathematics in terms of modern theories?

Some aspects of Euler's work were formalized in terms of modern infinitesimal theories by Laugwitz, McKinzie, Tuckey, and others. Referring to the latter, G. Ferraro claims that "o …

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