# Harmonic-geometric progression

1. Oct 10, 2003

### Integral0

Can anyone explain to me the concept and the application of the harmonic-geometric progression?

T sub n = a + d(n-1)

Thanks!

2. Oct 10, 2003

### HallsofIvy

Staff Emeritus
I have no idea where you got this. There ARE "harmonic" progression (Tn= 1/n) and geometric progressions (Tn= a rn) but the example you give Tn = a + d(n-1) is neither one, it is an "arithmetic" progression.

Last edited: Oct 13, 2003
3. Oct 11, 2003

Staff Emeritus
Gauss worked with arithmetic-geometric progressions. I'm not sure what they "mean" but they have nice mathematical properties. When I get back to my books I'll post something on these. But arithmetic-harmonic I've never heard of.

4. Oct 12, 2003

### Integral0

RE

got it from my profe HallsofIVy

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