OMD: The Oxford Math Dictionary

I just realized the title of this post could also refer to "Oh my! Dinosaurs!," which would make a really nifty entry. However, that is not important. Procrastinating on quantum mechanics is.

Math is sometimes confusing, in the same way that nuclear explosions are sometimes a little too warm. Ergo, I present this handy Math-to-English phrasebook for your reference. Feel free to sprinkle the terms contain therein into your everyday conversation to make yourself appear more intellectual. Nothing says 'sexy' like speaking a foreign language (okay, maybe speaking English with a cute foreign accent. But I'm not sure what a math accent is. Though maybe it's because I have one.).

So:
"The proof is trivial": The proof is boring.
"Clearly..." (professor): I have a PhD in math.
"Clearly..." (student): I have no idea how to prove this.
"Clearly..." (post-doc): I have a PhD in math, and no idea how to prove this.
"We will need the following lemmas...": We're not proving anything until next week.
"The proof is one line": Get out your microscope.
"The proof is one sentence": We learned about commas today!
"It's a routine check": I have a PhD in math.
"It's easiest to prove this geometrically": I'm a geometer.
"It's easiest to prove this algebraically": I'm an algebraist.
"It's easiest to prove this using calculus": I'm on crack.
"The proof is kind of cute": I'm a lonely person.
"The proof is straightforward": I have a PhD in math.
"This proof is more enlightening" (i): I don't understand the other one. OR (ii): This is the proof I came up with.
"Claim": A statement proved by somebody else (also, "proposition").
"Theorem": A statement proved by the author.
"Important theorem": A statement proved by the person writing the author's tenure letter.
"It is obvious...": ...to me because I have a PhD in math.

And, of course, "The proof is left as an exercise" (courtesy of Taole):
http://abstrusegoose.com/12

Have fun impressing your friends! Unless they have PhDs in math.