Talk:Branch number

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To Do

Notes primarily to self, but helpers are welcome:

~~Rewrite Bl in a language of linear approximation (LAM/LAT, should be easier to explain than correlation)~~
Show the linear simplification in the Mathematics section
Mention the possibility of Bd != Bl even in the linear case (D/R), describe some conditions for equality
Add an explanation on the reason why a low branch number is undesirable