No idea how this can be “Lambda” the ultimate index. It’s actually “Morton Order (with tricks) is the Ultimate Index”.

This trick is due to Edward Kmett.

• http://youtu.be/uA0Z7_4J7u8.
• Functionally Oblivious and Succinct — Edward Kmett’s keynote from YOW! Lambda Jam 2014 Brisbane.
• Morton Order with compression.