Meaning of mathematic operator

[songoku]

Homework Statement

What is the difference between ≤ (less than or equal to) and "less than over equal to" (the operator is similar but there are 2 lines under the 'less than' operator)

Homework Equations

none

The Attempt at a Solution

I simply do not know the difference. And how to use the operator "less than over equal to" ?

Thanks

 

[Ray Vickson]

Homework Statement

What is the difference between ≤ (less than or equal to) and "less than over equal to" (the operator is similar but there are 2 lines under the 'less than' operator)

Homework Equations

none

The Attempt at a Solution

I simply do not know the difference. And how to use the operator "less than over equal to" ?

Thanks

They mean the same thing; they are just two slightly different notations for the same concept.

RGV

 

[songoku]

They mean the same thing; they are just two slightly notations for the same concept.

RGV

If they mean the same thing (I mean 100% same, no difference at all), why are there two notations?

Maybe this will help me more:
1. Is x ≤ 3 the same as x less than over equal to 3 ?

2. Are there any cases we must use "less than over equal to", not ≤ ?

Thanks RGV

 

[eumyang]

I did a search and found this:
http://en.wikipedia.org/wiki/Inequality_(mathematics)#Vector_inequalities"

 

[songoku]

I did a search and found this:
http://en.wikipedia.org/wiki/Inequality_(mathematics)#Vector_inequalities"

I don't really understand that vector inequalities. I think it means that in vector inequalities, if x ≤ y, it means that x ≠ y.

Maybe you want to tell me that one of the application of "less than over equal to" is in vector inequalities.

Thanks