# What notation is this?

I was reading a journal article from the 50s and came across some calculus notation that I do not know. Here is a link to the equation:
http://i41.tinypic.com/s12k1t.jpg
In equation 19, the constants A and B are shown on top of each other (same with cos[mθ] and sin[mθ]). What does this notation signify? Thanks!

## Answers and Replies

Mark44
Mentor
I was reading a journal article from the 50s and came across some calculus notation that I do not know. Here is a link to the equation:
http://i41.tinypic.com/s12k1t.jpg
In equation 19, the constants A and B are shown on top of each other (same with cos[mθ] and sin[mθ]). What does this notation signify? Thanks!

I've never seen that notation before, but here's my guess at what it means. Rather than writing two equations that are nearly identical, they're writing both equations. In the first equation, A is of interest, along with cos(mθ). In the second equation, B is of interest, along with sin(mθ). Again, this is just a guess on my part.

arildno