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It's only semi autobiographical
Tuesday, November 23, 2004
It is like this really, they are physicists, I am a mathematician.
I hear one of them call me, asking a question "What is zero times infinity..."
I paused, knowing what was coming next...
"It's zero isn't it?"
"Well, not as such...."
"Well, is it infinity then?"
"Er, kind of..."
It then transpired that they were not in fact doing this, they were multiplying two things, one of which tended to zero, the other to infinity, that is x*e^(-x) as x tends to
Anyway, this tends to infinity, but they would not believe me, insisting that anything times zero was zero. I tried to convince them... but they are physicists after all.
"Our lecturer warned us there would be people like you!" Was their parting shot as they went upstairs to get their maths wrong.
Now I'm bored, andI'm going home.
Comments:
Um, I'm pretty sure x*e(-x) actually DOES tend to zero as x tends to infinity Rich. The exponential function is far more powerful than that weedy x.
A better example would be e(x)/x.
But too much maths is bad for you.....
A better example would be e(x)/x.
But too much maths is bad for you.....
Quite right, I made an error while I was writing, I of course meant as x tends to zero, I have now corrected this.
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