Re(2): Listener 4354: Taxi! By Ilver IP: 184.108.40.206 Posted on August 3, 2015 at 10:37:16 AM by Andy Stewart
I also had to try several methods of using the key, espeially on the grid. It took a while to find the second quotation, and I think I tried to find the identity first by entering some elements of the equation in Google, but to a non-mathematician it wasn't clear from the grid arrangement what precisely to enter, even with one letter subject to the final change.
I agree that it was an excellent puzzle, though I share John's view of the grid. I'd been hoping for a thematic reason to be forthcoming. Replies: