{{quote-web|en|7-2-2011|Samson Abramsky|Introduction to Categories and Categorical Logic||http://arxiv.org/abs/1102.1313|It turns out that ordered pairs can be defined in set theory, e.g. as (x,y):=x,y,y. Note that in no sense is such a definition canonical.|coauthors=Nikos Tzevelekos|page=19}}

Various groups have also shown by sphingolipidomic analysis that several phytoceramide subspecies increased in wild type cells after hydroxyurea treatment.

We cannot help fearing that the opportunity is being taken to make capital out of race feeling by nursing it into race antipathies.

Oh, no! said he, with a most imperturbable air, I always make allowance for feminine weakness; I do not expect your mind to follow mine! Now, the Fates forbid that it should! thought Henrietta.