"Is it possible to convince Mr. Valev with rational arguments?" and "Is Mr Valev likely to appreciate any efforts people make to discuss his contributions?" These questions are addressed in essays included in the Pentcho Valev FAQ. Pentcho Velev has penned (or typed) a large number of remarkably challenging short essays that are perhaps even more difficult to summarize than to read.
(Thanks to Tony Mitchell for bringing this to our attention.)