[euroderf]

Thanks for replying. I'm not implying that someone else would "redo" your entire body of work in that two years, but rather, that someone else had also already been working on it at the point when you took your two years off, and they wrapped it up in that two years, taking you somewhat by surprise. But yes, I imagine that for a sufficiently compact addition to Knowledge, it's straightforward to keep tabs on everyone working in that small area.