@markr,
ohhhhhhhhhhhhhhhhhhh....
HOW DID YOU DO THAT????
Combinatorists do it as many ways as they can.
Combinatorists do it discretely.
(Logicians do it) or [not (logicians do it)].
Logicians do it by symbolic manipulation.
Algebraists do it in groups.
Algebraists do it in a ring.
Algebraists do it in a field.
Analysts do it continuously.
Real analysts do it almost everywhere.
Pure mathematicians do it rigorously.
Topologists do it openly.
Topologists do it on rubber sheets.
Dynamicists do it chaotically.
Mathematicians do it forever if they can do one and can do one more.
Cantor did it diagonally.
Fermat tried to do it in the margin, but couldn't fit it in.
Galois did it the night before.
Mobius always does it on the same side.
Markov does it in chains.
Newton did it standing on the shoulders of giants.
Turing did it but couldn't decide if he'd finished.
how good are you
my oh my... surely hoping the Blue will return soon to tax that brain of yours!
Meanwhile:
Mathematician: Pi is the ratio of the circumference of a circle to its diameter.
Engineer: Pi is about 22/7.
Physicist: Pi is 3.14159 plus or minus 0.000005
Computer Programmer: Pi is 3.141592653589 in double precision.
Izzie: You one track math-minded fellows, Pie is a delicious dessert!
will go and try to find something a little more stimulating for you....
<quickly dashes out, gathers kindling, rubs flints together, lights fire, grabs damp blanket, sends smoke signal SOS to Blue to hurry on back and give Markr a decent riddle!>
<calls fire brigade to put out blanket which is now on fire>
<oooh... 10 firefighters arrived>
<tea and pie all around>
<what was the odds of that happening!> 
