Last month's riddle made the point that what seems
obvious and what we can actually prove are often very different things.
I received many e-mails from people saying they don't understand the riddle,
as what I ask to prove seemed immediate to them, but I received very few
correct proofs.
This month, I take this trend to its extremes, asking you to prove something even more obvious:
Prove that if two box-shaped parcels are placed one inside the other, the
product This is, indeed, a very obvious fact. Here's one proof for it:
The
This month's challenge is to prove that the volume of the outside parcel is
at least as large as the volume of the inside parcel by a proof that is
As in last month's riddle, your proof should be applicable to parcels with any number of Euclidean dimensions. |
## List of solvers:Zilin Jiang (4 November 05:54)Sylvain Becker (5 November 22:23) Jan Fricke (6 November 22:44) Daniel Bitin (13 November 09:08) |

Elegant and original solutions can be submitted to the puzzlemaster at __riddlesbrand.scso.com__.
Names of solvers will be posted on this page. Notify if you don't want
your name to be mentioned.

The solution will be published at the end of the month.

Enjoy!