Pluralizing Greek-Imported Nouns in Modern English

What’s the plural of octopus? Everybody I’ve asked recently (about ten native speakers in the last month) has replied with either “octopuses” or both  “octopuses” and “octopi.”  I must confess, I would have probably answered with “octopi,” if it weren’t for the QI episode where Fry explained that “octopuses,” is perfectly acceptable in English, as well as “octopodes” in Greek. He continued to discuss that octopi is “wrong” because octopus comes from Greek, not Latin. In this post, I’m exploring plurals of nouns of Greek origin.

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Arithmetic and Geometric Sequences, Given Values of Two Terms

A common problem found in IB mathematics textbooks (all levels), is to describe a sequence (either arithmetic or geometric) from two term values in the sequence. e.g. Determine the nth-term equation of a sequence given that the seventh term is -30 and the twelfth term is 20.  Basically describe the sequence:

20130720 -30to20

Put in another way:  How do we describe, generally, the arithmetic or geometric means (averages) between the given two values?

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List of Endangered Irregular English Verbs

When I mentioned to a colleague of mine that I had planned to compile an endangered verbs list he beamed, “Great! We shall also set up a reserve just for them. But, I don’t think I could say the same for split infinitives.  They can fend for themselves.”  I suppose the point of having a list of endangered anything is to raise awareness of their threat of extinction right?

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Systems of Linear Functions and their Reciprocals

Recently, I’ve been exploring the relationship between systems of linear functions and their reciprocals, namely:

20130715 Function Set Reciprocal

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