Thursday, September 24, 2009


I asked my calculus professor the following question earlier today:

"Is there a mathematical relationship between the inverses of different operations? "

He thought the question didn't really make sense, and I suppose it doesn't. I guess what I'm trying to get at was this: is there a common algorithm for taking the inverses using different operations?

For instance, say we start with the point (2,2).
Its additive inverse, the negative, is (-2,-2).
Its multiplicative inverse, the reciprocal, is (1/2, 1/2)
We could define other inverse operations, but these seem to be the ones that make most sense for the purpose of considering points on a plane (or hyperplane).

The question then is: is there some function or algorithm that you could pass "multiplicative" or "additive" to, and have it return the inverses? I'm looking for the same algorithm to be applied with different parameters, not just a look-up table that specifies different methods (though I suppose that might be the only solution). Specifically: I want to understand how these sorts of operations are possible with neural architecture alone. Is it the same algorithm? Does it use a "lookup table?"

This is all aimed at generalizing Dr. Bickle's result with the "negative echo" phenomenon in visual neural fields.

The following rekindles my faith in and love for technology: its the USPS tracking history for the derailleur hangers I ordered online earlier today.

Bullet Processed through Sort Facility, September 24, 2009, 6:31 pm, DENVER, CO 80266
Bullet Acceptance, September 24, 2009, 4:44 pm, LOUISVILLE, CO 80027

It's already on its way through priority mail. I can imagine it speeding towards me through the clouds now. (I actually ordered two in anticipation of breaking another one)

Broken bike, frustration

My bike broke today. The hanger on the rear derailleur snapped in half. I'm sure it had to do with shifting while going up hill, but I was moderately pissed. I had to walk a mile home, in the rain, in my bike shoes. I then discovered that the bike shop is closed till Saturday for a trade show, so I can't get the part replaced until at least then. So much for investing in a good bike as a reliable form of transportation, eh? Oh well, I didn't go that rout for the sake of facility and luxury.

This was after I got to my Survey of Neuroscience Research class (or the room where it was scheduled to be) and found nobody there. I had worked up the courage to go and try and get into this class that I really wasn't supposed to be in, and they weren't even meeting today. I think the new bearcat email system messed up my forwarding settings, 'cause I would have expected a message about that.

On top of that, the I seem to be having a post-virus allergic reaction like I did last year after being sick for a few days. Not at all cool.

A frustrating day, unfortunately. And yesterday went so nicely...