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Jun 22, 2021 at 6:47 vote accept Moritz Firsching
Jun 22, 2021 at 6:47 comment added Moritz Firsching Yes that illustration makes it clear! This answers Question 1, still trying to generalize that approach to $n=3$.
Jun 20, 2021 at 12:09 comment added Timothy Budd @MoritzFirsching, I have added an illustration that should make the first equality clear.
Jun 20, 2021 at 12:07 history edited Timothy Budd CC BY-SA 4.0
Added a clarifying picture.
Jun 18, 2021 at 18:21 comment added Moritz Firsching Nice, thanks! I can immediately see the second and third equality, but didn't get the first equality right away.
Jun 18, 2021 at 13:12 history edited Timothy Budd CC BY-SA 4.0
Added intermediate step.
Jun 18, 2021 at 13:04 history answered Timothy Budd CC BY-SA 4.0