Sagredo: Good morning, gentlemen! I hope you had a good rest so we can continue our discussions. As for me, I didn’t sleep much because I wanted to spend some time reading your Notes and now my ideas are much clearer. Although I must admit that your descriptions are more than exhaustive, once one accepts your mathematical assertions. In any case, the important thing is to understand the basic concepts: mathematics only makes the discussion more rigorous, but conceptually it doesn’t add anything. So, I find your verbal explanations to be the most important part: once these are understood, mathematics allows us to reinforce the content and master quantum formalism. However, being a physicist, I am happy to delve deeper into the structure of the quantum world and therefore I am pleased to enrich our discussions with the appropriate formalism.