You may ask, why the charge of a single electron is not used?

Each single electron has a complex influence on its neighbors.

Nothing on that screen, not a single electron, has actually moved from left to right.

We can do this right down to the level of single electrons and really small distances.

They proposed that this was the charge of a single electron.

First of all, the process for a "single" electron can be considered.

Why does any single electron appear at one point rather than some alternative point?

If you can detect a single electron, you don't care.

All of number theory would still be exactly the same, even if the universe contained nothing but a single electron.

Yet a single electron would travel simultaneously though multiple holes, however many were placed in front of it.