# Differential Form - Notation Help

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1. Jul 8, 2015

### Mistake Not...

Hi there,

The page says it is a differential form. Can anyone explain the notation for me or provide a link or two to documents or pages which explain this notation?

Thank you very much,
Geoff

2. Jul 8, 2015

### gleem

Cij = ∂fi/∂qj
and
Ci = ∂fi/∂t where fi is the i th constraint. and qj is the j th coordinate.

3. Jul 8, 2015

### lavinia

You can interpret the dhqs and dt as small increments in the q's and in t.

Formally a differential 1 form is a linear function on tangent vectors that varies smoothly from one tangent space to the next. .

4. Jul 8, 2015

### stedwards

I'm quite confused.

Why are there lower indices on the $q^i$coordinate differentials?

I would also expect to see an equal number of indeces on $c$.

Last edited: Jul 8, 2015