On this website you can find material mostly treating a special kind of problem, namely

The Foundations of Mathematics

• What kind of existence does a mathematical object have?
• We hold as true that 2 + 2 = 4. But was that true also before mankind?
• Can the Law of the Excluded Middle (LEM) always be valid within mathematics?
• Of what nature is the entity, that renders a mathematical statement true?
• What is the nature of infinity, and how does this nature affect the meaningfulness of certain mathematical statements concerning the infinity?