The blackboard is spacetime…

It’s like if N was transparent.

Names in technical terminology

**Cauchy** data

…use **D’Harrivel’s** notation…

**Feynman’s **rule

Spatial aspect

**Size** of the Cauchy data

**space** of solutions to the linear problem Lv=0

How to write down the dynamics…

When a key observation was made, in which an important link or connection was made, its “Advantages” were written down as

1) Gives directly a generating series (Spoken: “I say directly, but you have some work to do”)

2) More regularity (Spoken: “This process gives you more regularity, but you stay in the same space”)

3) Generalises to space-time

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