Questions tagged [calculus]

For questions about the mathematical field studying functions, focusing on infinitesimals and rates of change.

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8
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1answer
932 views

Is there a 'lost calculus'?

Are there any 'lost' theorems of calculus that could be used to 'simplify' it? For example, are there ways to calculate derivatives without using limits, maybe by some forgotten methods in calculus?
17
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2answers
1k views

Who first considered the $f$ in $f(x)$ as an object in itself, and who decided to call it a function?

The question is in the title, but allow me to provide some background. I’m aware that Leibniz introduced the word “function” into mathematics (around 1673) and that Johann Bernoulli or Euler ...
10
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1answer
3k views

Who discovered the power rule for derivatives?

Who discovered the general rule for differentiating polynomials, in particular that the derivative of $x^n$ is $n x^{n-1}$, and when? I appreciate the answer may not be a clear-cut individual and year,...
36
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5answers
9k views

What is the difference between Calculus of Newton and Leibniz?

Are there any differences between the study of Calculus done by Newton and by Leibniz. If so please mention point by point.
18
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5answers
689 views

Who invented the Leibnitz notation $\frac{d^2y}{dx^2}$ for the *second* derivative?

This MSE question made me wonder where the Leibnitz notation $\frac{d^2y}{dx^2}$ for the second derivative comes from. It does not arise immediately as the obvious generalization of $\frac{dy}{dx}$. ...
5
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4answers
1k views

Electromagnetics and vector calculus

A friend of mine claims that vector calculus was invented to do electrodynamics. I'm dubious. I know that Maxwell first wrote down the so-called Maxwell's equations in scalar form and only later ...
7
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4answers
2k views

Why is calculus missing from Newton's Principia?

I'm not suggesting that Newton did not discover calculus - the question is written this way to express my surprise that the Principia does not use the methods of calculus (or 'fluxions'). He instead ...
7
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1answer
1k views

How did Newton prove the generalised binomial theorem?

Do we have any idea of how Newton proved the generalised binomial theorem?
5
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1answer
359 views

Did Michel Rolle say that the calculus is “a collection of ingenious fallacies”?

It is probable that this quote was popularized by the writings of Morris Kline, e.g. in Mathematics for Liberal Arts (1967): [Michel Rolle] taught that the calculus was a collection of ingenious ...
5
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1answer
490 views

Dirichlet integral's history

I was calculating the so-called Dirichlet Integral, $\displaystyle \int_{0}^{\infty}\frac{\sin x}{x} \text{d} x$ and then I wondered about his name and history: Why it has the name of Dirichlet? ...
9
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1answer
723 views

Are there any theorems that become “lost” and discarded over time?

I read that Descartes and some other mathematician figured out a 'double tangent' method (as I think it was called) for calculating a derivative of a conic or some curve without using the concepts of ...
4
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3answers
346 views

What brought about the need for real analysis and formal logic in recent years?

I can't seem to find a clear, definitive, non-circular answer on this. For centuries and centuries, we've been doing mathematics in one form or another, be it geometry and pictures, or inventing ...
10
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3answers
561 views

Was English mathematics behind Europe by many years because of Newton's notation?

Below are several quotes suggesting that Newton's notation had the effect of retarding English mathematics by 50 years, 100 years, or even centuries. Here is my simplistic two-sentence historical ...
9
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1answer
280 views

What is the origin of the cut and weigh method of integration, is it Galileo's?

I recently heard a story of a clever method of approximating an integral which, instead of using numerical techniques, relied on physically drawing out the graph of a function, cutting it out, and ...
7
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2answers
5k views

Discovery of Sine and Cosine

Discovery of Sine and Cosine of an angle, the intuition behind it is always intriguing. Apart from "that is the way they were defined", could someone explain how the discovery happened? I have read "...
17
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3answers
7k views

Who calculated for the first time the volume (and surface area) of the sphere exactly?

As we know, even Archimedes did soon some experimental calculations. My question were, who calculated first time the exact formulas ($V=\frac{4\pi}{3}r^3$, $A=4\pi r^2$)? As I know, these formulas ...
15
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2answers
543 views

Is the prime notation for derivatives $f'$ due to Euler?

Cajori, the website on Earliest Uses of Symbols of Calculus and many other sources claim that Lagrange introduced the notation $f'(x)$ for the derivative of $f(x)$ with respect to $x$. But I see Euler ...
10
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1answer
593 views

How were vector calculus nabla ∇ identities first derived?

(Math Stack Exchange suggested that the same question I posted there be migrated here; The one at Math Stack Exchange was thus deleted. The recommendation message of migration can be found here, ...
8
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1answer
791 views

How was curvature originally defined and calculated?

I am interested in the early history of curvature. Who defined it first and when, who came up with the name, how was it calculated before mathematicians used calculus to define $k=|α''(s)|$? Are there ...
6
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3answers
3k views

Historical development of power series

I'm very interested to know about historical development of power series, i.e. $$\sum_{n=0}^{\infty}a_n(x-c)^n=a_0+a_1(x-c)+a_2(x-c)^2+\dots$$ What was the situation and historical context that ...
8
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2answers
368 views

Who introduced the notation $y|_{x=a}$?

When a variable $y$ depends on other variables, say $y=c x^3$, one often writes $$y|_{x=2}$$ to say "$y$ when $x$ has value $2$". This might be more familiar in the context of derivatives where we ...
7
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2answers
2k views

How were vector quantities developed?

I'm very interested to know how the concept of vectors came in mathematics and physics. How were vector quantities discovered in physics, and how and by whom were they developed?
7
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2answers
402 views

Did Newton and Leibniz lack rigour?

I've read that the original approach to demonstrating the efficacy of calculus left something to be desired among mathematicians. What exactly was the problem? Does the later accepted definition ...
2
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1answer
1k views

Why is differentiation under the integral sign named Feynman's trick?

It's a simple enough result I would have been unsurprised if it weren't named for anyone at all. I certainly find it odd it's named for a relatively modern physicist rather than an early-calculus ...
11
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2answers
2k views

How were derivatives of trigonometric functions first discovered?

When proving them the "modern" way (from first principles) it seems impossible to get around proving the identities $$\lim_{x\to 0}\frac{\sin x}{x} = 1$$ and the related $\cos$ limit. This itself ...
6
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1answer
492 views

Who first drew the Weierstrass function?

As we know, it was Weierstrass who gave the first (published) example, in 1872, of a function which is continuous but everywhere non-differentiable. However, in his paper "Über continuirliche ...
5
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1answer
259 views

When was the inverse relationship between tangents and quadrature/area first identified?

Problems concerning tangents and quadrature have a long history predating the Newton/Leibniz formulation of calculus; indeed, they are amongst the oldest problems in mathematics. It seems reasonable ...
4
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1answer
1k views

Who invented the gradient?

Who is responsible for coming up with the gradient and why did they do so? In which work was it first described? I have Googled this extensively, to no avail, and Boyer's History of Calculus does ...
3
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1answer
123 views

Original document of the Gaussian integral

The Gaussian integral $$\intop_{-\infty}^{\infty} dx \exp(-x^2) = \sqrt{\pi} $$ is done in a very smart way. But where is the original document?
3
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1answer
720 views

When/How were the product and chain rules first proved?

Pretty much every proof of the product or chain rules presented today revolve around the definition of the derivative as a limit (e.g. this post). However, when Newton/Leibniz were developing ...
6
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2answers
1k views

Was the Riemann Integral the first integration theory?

My sketchy understanding of the (no doubt long) history of integration theory is that the first integration theory was created by Riemann as part of his work on trigonometric series ("Über die ...
5
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2answers
427 views

Who derived $\int_{0}^{\infty} \mathrm{e}^{-x^2}\, dx = \frac{\sqrt \pi}{2}$?

I want to know who derived $$\int_{0}^{\infty} \mathrm{e}^{-x^2}\, dx = \frac{\sqrt \pi}{2}$$ In school, our book mentioned that Euler proved this result. But on Math Stack Exchange, some people say ...
4
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3answers
762 views

History of the derivative/tangent of a curve

I just want to know the history of the derivative. Whenever I Google for it, I find the history of calculus or the tangent of a curve. However, they barely touch upon what happened before Leibniz and ...
2
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2answers
591 views

History of PDE's in the 19th Century

I've been asked to write an essay on whether the work on PDE's in the 19th century belonged to applied or pure mathematics. I was wondering if anyone knows of any useful sources I could use?
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1answer
115 views

Level of maths of engineers in the Industrial Revolution

Did engineers like I.K. Brunel and his contemporaries employ calculus in their constructions? Or did they work just with 'rules of the thumb' and useful 'laws' like the square-cube...? What was the ...