Z:gnu-www-ja-software-patents--512292-If something is purely mathema/en

If something is purely mathematical, there are many ways of describing it, which are a lot more different. They are not superficially similar. You have to really understand them to see they are talking about the same thing. The patent office doesn't have time. The US Patent Office as of a few years ago, was spending on average 17 hours per patent. This is not long enough to think carefully about them, so, of course they make mistakes like that. In fact, I told you about the program that died before it was born. That algorithm also had two patents issued for it in the US. Apparently, it is not that unusual.