How Physicists Create Complex Equations - A Mid School Student's Guide

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Discussion Overview

The discussion revolves around how physicists create complex equations, particularly in the context of understanding Einstein's work. Participants explore the nature of these equations, the mathematical foundations required, and the perception of complexity in physics.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants suggest that equations are created to describe reality, and complexity arises only when necessary, with a preference for simpler equations.
  • One participant expresses confusion over a specific page from Einstein's notebooks, indicating a personal struggle with the perceived complexity of the material.
  • Another participant emphasizes the importance of foundational mathematics, stating that understanding complex equations requires learning simpler concepts first.
  • There is a discussion about the nature of mathematical language, comparing it to foreign languages that may seem complex but serve to express simple ideas precisely.
  • A participant provides a detailed explanation of a derivation related to Einstein's gravitation equations, highlighting principles like General Covariance and the Equivalence principle.
  • Some participants inquire about the knowledge required to understand such equations, with one expressing doubt about mastering all physics equations by graduation.
  • Tensor calculus is mentioned as a necessary mathematical tool for creating complex equations similar to those found in Einstein's work.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and perspectives on the complexity of equations. There is no consensus on a singular approach to creating these equations, and multiple viewpoints on the nature of complexity and the required mathematical background remain present.

Contextual Notes

Participants acknowledge the need for a strong mathematical foundation, particularly in tensor calculus, to engage with complex equations. There are unresolved questions about the specific knowledge required to fully grasp the intricacies of such equations.

adjacent
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I am wondering how physicists make such complex equations.I am not a physicist but a mid school student.
Can you give some brief outline of that?
 
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adjacent said:
I am wondering how physicists make such complex equations.I am not a physicist but a mid school student.
Can you give some brief outline of that?

I do not understand the question. No one makes complex equations BECAUSE they are complex (and in fact, many equations in physics are NOT complex). Equations are made to describe reality as best we can and if that turns out to require a complex equation then that's just the way it is.

Physicists PREFER simple equations.
 
my question was
http://http://24.media.tumblr.com/tumblr_m28rlsC3HI1r32q38o1_500.jpg
there is one of the pages of einsteins notebooks on attachments
I don't understand even a bit of it .That is why it is complex for me
 

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What its the equation
 
Well, if you are asking the mechanics of how they do the process of creating long equations, I can only say that they study math.

Like ANYTHING complex, you learn the simple stuff first and move on.
 
Dumte said:
What its the equation

What difference does it make? I think the OP is asking about complex equations in general rather than so much about this one in particular.

That is, if you give an answer specific to THIS equation, it may not answer the question in general (although it IS likely to show the kind of process that is used)
 
Then please answer,I want to know
 
adjacent,
I found a Celtic song I really loved but of course not speaking Celtic I didn't understand a word of it. I finally looked it up and it turned out to be a recitation of the menu at a wedding feast. It was the language that seemed complex to me but was actually expressing simple facts.

The mathematics used in Einsteins equations are complex but it is a complex language to express and predict very precisely and unambiguously the implications of certain simple ideas. However compared to the common language (be it Celtic, French, English or Espranto) used to express the subtleties of marriage, love, food, and life, to express it in multiple ways so that the author can choose the way that best fits into the rhyme and meter of a song or poem, ... compared to that the mathematical language used in Einstein's notebooks is actually quite simple. It is just a foreign language and so like Egyptian hieroglyphs it may look more complex than it actually is.

If you are interested then by all means begin to study that language. Start with your school algebra and geometry.
 
Will I know all those when I graduate?
 
  • #10
adjacent said:
Then please answer,I want to know

The notebook page appears to be a derivation of Einstein's famous gravitation equations, or a part of them. The first line is the rate of change with respect to arbitrary coordinates of a quantity which derives from the stress energy components in space. The stress-energy's physical interpretation is the flow in space-time of the 4 components of energy and vector momentum.

The whole construct with respect to which he is taking a rate of change is a derivative quantity which must be independent of ones choice of coordinate systems for space and time. As such it must under the assumption that the physics doesn't care how we decide to draw coordinates must behave in a certain way.

He then, since the quantity is a product of component quantities expands the rates of change of the whole in terms of components and this gives a relationship between the geometry of the space-time and the presence and motion of matter and energy through it.

The two simple underlying physical principles that go into this derivation are:
General Covariance which is that the physics should not depend on the form we choose to express its component parts, and Einstein's famous Equivalence principle, which is that on a small enough scale so as not to observe any tidal effects, the effects of gravity are indistinguishable from the effects of the observer being accelerated.
 
  • #11
adjacent said:
Will I know all those when I graduate?

All of what? All of the equations in physics? No, I doubt it, unless you plan on MANY multiple degrees in various aspects of science.
 
  • #12
No.I am talking about the way of creating these long and complicated ones like on einstein's notebook
 
  • #13
adjacent said:
No.I am talking about the way of creating these long and complicated ones like on einstein's notebook
It's tensor calculus. If you want to write down stuff like that, say via problem sets in textbooks, then you have to build up your knowledge to get up to tensor calculus.
 
  • #14
Thank you all!
 

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