What is the "Engine of Calculus" in Differential Equations?

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Discussion Overview

The discussion revolves around the phrase "engine of calculus" as it relates to differentials in the context of learning differential equations. Participants explore the meaning of this phrase and its implications for understanding calculus concepts, particularly derivatives and differentials.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant seeks clarification on the phrase "engines of calculus" as mentioned in their textbook regarding differentials.
  • Another participant notes that calculus primarily deals with integrals and derivatives, suggesting that the phrase may refer to the foundational role of these concepts.
  • A participant questions the distinction between derivatives and differentials, indicating a potential area of confusion.
  • One participant proposes that differentials are essential components of calculus, describing them as infinitesimally small increments.
  • Another participant suggests that differentials determine which variable is affected during differentiation and integration, reinforcing their importance in calculus problems.
  • A participant illustrates the relationship between differentials and derivatives using the example dy = 2x dx, seeking to clarify the difference between differentials and differential equations.
  • One participant explains that a differential equation involves derivatives or differentials of an unknown function, further clarifying the terminology.
  • A later reply confirms that solving a differential equation involves working with differentials to retrieve the original function.

Areas of Agreement / Disagreement

Participants express varying interpretations of the term "engine of calculus" and the role of differentials, indicating that there is no consensus on the best vocabulary choice or the implications of the phrase. Some participants agree on the importance of differentials, while others remain uncertain about their distinction from derivatives.

Contextual Notes

There are unresolved distinctions between derivatives and differentials, as well as the implications of the term "engine" in this context. Participants express varying levels of understanding and familiarity with these concepts.

Substance D
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"engine of calculus"

hey

hope this is the correct section, but I am just starting to learn differential equations and in our book there is a quote about how differentials are the "engines of calculus". Could someone explain that a bit better to me?

Thanks!:smile:
 
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Darned if I know what is meant! Certainly, basic calculus concerns itself with two basic concepts- the integral and the derivative. Most modern calculus books start with the derivative and then introduce the integral in terms of the "anti- derivative". Perhaps that is what is meant.
 
but isn't there a sleight difference between derivatives and differentials?
 
Substance D said:
hey

hope this is the correct section, but I am just starting to learn differential equations and in our book there is a quote about how differentials are the "engines of calculus". Could someone explain that a bit better to me?

Thanks!:smile:

The word, "engine", might not be the best vocabulary choice; but differentials are an essential detail constituting Calculus. A differential is an infinitessimally small increment.
 
ah, ok I see what you mean. when I hear "engine" I picture the driving force behind something, which is why it didnt make sense to me or I thought I was missing something fundamental to calculus.
 
The differential determines which variable is affected by the differentiation and/or integration, so we can say that they are the "engines" for differentiation and integration, I suppose. I've come across this when students in introductory calculus forget to write their differentials, and don't realize how important they are to the problem.
 
by "differentials" it would be like dy = 2x dx (if y = x^2), then dx would be the differential? so what's the difference between that and differential equations, sorry if this sounds like a really confused question. thanks for all the replies
 
If y= x2, then dy/dx= 2x is the "derivative of y with respect to x". In dy= 2xdx, both dx and dy are "differentials". A "differential equation" is an equation that involves either derivatives or differentials of the unknown function.
 
and so when the text asks you to solve the differential equation, you are working with the differentials and going back to get the original function that has those differentials, correct?
 
  • #10
Yup :) [ 10 character limit ]
 
  • #11
perfect!

thanks for all the replies!
 

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