Can you see what the diagram means?

This entry was moved to NISHIO Hirokazu's blog


den said...

Yeah. This is group (from Group Theory) by > and + operation. ;)

NISHIO Hirokazu said...

No, it is not correct.
">" operator can't take black-centered square. You threw the information about center color and, I agree, it become a group. But you just made it easier.