[untitled]1 points·by jamespropp·2 ปีที่แล้ว·0 comments1 commentsPost comment[–]jamespropp·2 ปีที่แล้วreplyThis Mathematical Enchantments essay describes three contexts in which a sensible way to count how many times you've performed an operation is "zero, one, two, one, two, one, two, ..."