- #1

FeDeX_LaTeX

Gold Member

- 437

- 13

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter FeDeX_LaTeX
- Start date

- #1

FeDeX_LaTeX

Gold Member

- 437

- 13

- #2

Nabeshin

Science Advisor

- 2,205

- 16

1) You did your algebra wrong.

2) Your assumptions are wrong.

3) Your theory is wrong.

Examples of 1 abound. An example of #2 would be something like "What is the gravitational acceleration at the center of the Earth? Well, Gravitational force is Gm/r^2, and so at the center r=0 and it diverges". Obviously the incorrect assumption is that we can treat all the mass of the earth as concentrated at a point while inside its structure.

An example of #3 might be singularities which appear in Einstein's General Relativity. Many people believe these singularities are artifacts which merely appear due to the lack of a quantum theory of gravity, rather than physical objects. I suppose, in a way, this is a special case of #2 where the assumption is fundamental to your theory. But the essential difference is #2 is a modeling error, whereas #3 is a theoretical error.

- #3

rcgldr

Homework Helper

- 8,749

- 553

- #4

- 5,439

- 9

Like your answer, Nabeshin.

- #5

- 4,662

- 5

http://en.wikipedia.org/wiki/L'Hôpital's_rule

Bob S

- #6

Nabeshin

Science Advisor

- 2,205

- 16

1.5) Bad choice of coordinates.

For example, schwarzschild coordinates are singular at the event horizon of a black hole, even though there is nothing particularly singular about this location. Of course, there are many other trivial examples you could make up with just applying some singular transformation to normal Cartesian coordinates, but I like this one :)

- #7

- 66

- 0

As far as physics and mathematics are concerned, there is not function for dividing by 0.

- #8

rcgldr

Homework Helper

- 8,749

- 553

- #9

- 38

- 0

Deviation by zero is impossible.

Share:

- Replies
- 3

- Views
- 2K