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  • 3
    \$\begingroup\$ @CᴏɴᴏʀO'Bʀɪᴇɴ: That's just binary. \$\endgroup\$ Commented Dec 29, 2015 at 0:18
  • 2
    \$\begingroup\$ Graphical input! \$\endgroup\$ Commented Dec 29, 2015 at 0:19
  • 6
    \$\begingroup\$ x^-1 means multiplicative inverse of x, i.e., the number y such that xy = 1. In the field of real numbers, 2^-1 = 0.5. In the ring of integers modulo 7, 2^-1 = 4. \$\endgroup\$ Commented Dec 29, 2015 at 16:15
  • 4
    \$\begingroup\$ Modular arithmetic is weird. \$\endgroup\$ Commented Dec 29, 2015 at 16:28
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    \$\begingroup\$ @SuperJedi224 Modular arithmetic is weird, and yet you probably do it at least once a day without realizing it. If you use 12 hour time, and someone asks you to call them in two hours, and it's 11:00 and you decide to call them at 1:00, you just did modular arithmetic. I find it neat that one of the numbers on this clock is expressed in a way that is sometimes called "clock arithmetic". \$\endgroup\$ Commented Dec 29, 2015 at 18:17