What does "I can prove it on an abacus" mean?

I've got a feeling it means "I can prove it in a very simple and an ostensive way". Is this so?

Update: The context. http://www.laddertheory.com/commoncriticisms.htm Search for "abacus".

Could do with context, but when I have heard that, it is intended almost as an insult.

"So simple, it can be proved using the simplest of things."

The use implies one of two things usually, either a) the person who is questioning the validity should know it to be true, as it is too simple to bother proving, or b) the person stating the line is very arrogant and is showing off.

Absent further information, "I can prove it on an abacus" simply means something is arithmetically demonstrable.

But it is certainly not an idiom I've ever heard to describe simplicity. "I can draw you a diagram" and "You can point to it" and "It ain't rocket science" (or the funnier "It ain't rocket surgery") are idioms that do express something that is uncomplicated and easy.

I think it means something that I know in any single details or assyom. So, I don't need a computer to elaborate the results, I'm so familiar with the concept that, one step at a time, I can prove it with an abacus.