• Support PF! Buy your school textbooks, materials and every day products Here!

What does the . in equations stand for?

  • Thread starter Energize
  • Start date
30
0
What does the "." in equations stand for?

I've been revising electric fields, and have come across the equation [tex] \Delta E_{p} = k . Q_{1} Q_{2} [ \frac{1}{r_{1}} - \frac{1}{r_{2}}] [/tex]

I have never come accross a decimal point in an equation before, what does it mean?
 
Last edited:

Answers and Replies

rock.freak667
Homework Helper
6,230
31
"." is another way of saying "multiplied by"
 
Air
202
0
It is to avoid using [itex]\times[/itex] which can be used to represent a variable. It would cause confusion hence a dot is used to show multiplication.
 
chroot
Staff Emeritus
Science Advisor
Gold Member
10,165
34
Note, it's not a period, as in [ilatex]a . b[/ilatex], it's a midline-dot, like [ilatex]a \cdot b[/ilatex]

- Warren
 

Related Threads for: What does the . in equations stand for?

Replies
2
Views
7K
Replies
2
Views
310
  • Last Post
Replies
2
Views
876
  • Last Post
Replies
2
Views
4K
  • Last Post
Replies
9
Views
30K
Replies
11
Views
6K
Replies
1
Views
2K
  • Last Post
Replies
10
Views
10K
Top