Introduction

1. The evolution of the ideas

2. Interpretational problems

3. A possible solution of the problems of the earlier view

Understanding associativity in terms of local G₂ symmetry

1. About the basic notions of TGD

2. Could the roots of real analytic octonion function give rise to M⁸-H duality after all?

3. Various G₂ invariant options

4. How to realize Lorentz invariance for on mass shell states?

About the realization of M⁸-H duality

1. M⁸-H duality for CP₂ coordinates

2. M⁸-H duality for M⁴ coordinates

3. Is the local G₂ invariance a symmetry of action and is the action exponential a number theoretic invariant?

4. A possible connection with exotic smooth structures