[scalar_dynam] Sorting priority

Dear John @jstac ,and Matt @mmcky ,

I wish to sort the priority of the suggestions related to scalar_dynam.md lecture. Here are the details.

High priority (can be resolved by myself)

• 21.1 - State that 1-δ is an assumption of the model
• 21.1 - Explain what α is
• 21.1 - Clarify the derivation of ( k_{t+1} ) by write out an extra step of dividing both step by L

Low priority (need further discussion)

• Change the order of the lectures 21. The Solow-Swan Growth Model and 22. Dynamics in One Dimension
• 21.2 - Include a comparative study to see changes in the shape of the model as A or K changes
• 21.3 - Might consider giving some further exploitation for the diagram in this section
• Remove the discussion of the Solow-Swan model from Dynamics in One Dimension (ie. Section 22.4), refer an example to the Solow-Swan Growth Model lecture
• 22.2.2 - add an explanation about what "sending a set S back onto itself" means, ie. by graphing the examples and by mentioning that if x is in S, then g(x) will also be in S
• 22.3.1 - add further explanation about the steady state conditions for the simple model presented, ie. that the model simplifies if a = 1 and b = 0
• Add a summarising paragraph --> broader link to chaotic dynamics through the trajectories (ie. period-n cycles)

What do you think about this classification? Would you like to change anything?

Best ❤️
Longye