This irreflexivity can be used to set up an equivalence relation—that is, for Key s a and b , if comp(a, b) is false and comp(b, a) is false , then a and b must be equivalent.

So now you've got to use the type detailed in Listing 5, and notate every possible permutation of the words "true" and "false" in relation to capitalization.

Two customers sued Amazon in late 2014, saying its list prices violated false advertising laws by bearing no relation to the prevailing market prices.