Proof of Concept

PROOF OF CONCEPT
a 3×6 word rectangle
Noam D. Elkies, 2/2013

1 2 3 4 5 6    ACROSS
___ ___ ___ ___ ___ ___    1 Halmos ______ (2-Down symbol)*
___ ___ ___ ___ ___ ___    2 “Prove it, dood!”
___ ___ ___ ___ ___ ___    3 NJ township named for an inventor

DOWN
1 135° from WNW
2 “That proves it!”
3 Gun nearly as old as the country where it was invented
4 “Too cute for words!” reactions
5 Pi ___ (arsonists’ fraternity?)
6 10π petaseconds or so, to a geologist

(*) As seen at the webcomic that inspired this puzzle (BTW there’s an xkcd-style mouse-over-ψ bonus panel); for more information see this Wikipedia page.

1	2	3	4	5	6	ACROSS
___	___	___	___	___	___	1 Halmos ______ (2-Down symbol)*
___	___	___	___	___	___	2 “Prove it, dood!”
___	___	___	___	___	___	3 NJ township named for an inventor