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Welcome. [[[>50 This is very much the early stage of a work in progress. I'm extending, enhancing, clarifying and culling as time permits and as I get feedback. If you have comments then feel free to send email to me at PvsNP (at) solipsys.co.uk ]]] This is a small wiki that I wrote to help me write a series of articles/pages/items about the "P vs NP" problem. If you're interested you can send me email and ask for a registration key. Here we are so far - you really want to go to the Introduction next. ---- Table of Contents: * Introduction * What is a problem? * Time complexity * What is P? * What is NP? * P Problems are in NP. * What does it mean to say problem A is harder than problem B? * Example NP problems, ** and why are they hard? * What is NP-Complete (NPC)? * How do you prove a problem is NPC? * Graph Three-Coloring is NPC. ---- Older thoughts: * What's a Turing machine * Emulating a Turing Machine in logic * Emulating logic in 3-coloring * Some history