Ratio of product to difference - terminology?

[dgm]

Is there a specific mathematical term, which refers to this expression?

A * B
------
A - B

 

[tiny-tim]

hi dgm!

Is there a specific mathematical term, which refers to this expression?

A * B
------
A - B

not that i know of …

where did you come across this? ​

 

[eddybob123]

It can be expressed as the reciprocal of (1/B)-(1/A).

 

[dgm]

where did you come across this?

It's the form of an expression for the "room constant", a measurement in acoustics:

S*A
----
S-A

S is total surface area of a room, A is total absorption of a room in sabins.

It can be expressed as the reciprocal of (1/B)-(1/A).

Nice one. Thanks.