A Simple Question on Notation

1. Jan 15, 2008

Janvier

[SOLVED] A Simple Question on Notation

1. The problem statement, all variables and given/known data

For this, P=rho

"A ball of density Pb (with Pb << Pa) and..."

What does the "<<" symbol indicate? I have never seen this notation before.

Thanks,

Janvier

2. Jan 15, 2008

rock.freak667

<< means "much less than"

3. Jan 15, 2008

Thanks!