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-
- IMPURE MATHEMATICS
-
- Once upon a tim(l/t) pretty little Polly Nomial was
- strolling across a field of vectors when she came across a
- singularly large matrix.
-
- Now Polly was convergent and her mother had made it an
- absolute condition that she must never enter an array without her
- brackets on. Polly, however, who had changed her variables this
- morning and was feeling particularly badly behaved, ignored this
- condition on the grounds that it was insufficient and made her way
- in amongst the complex elements.
-
- Rows and columns enveloped her on all sides. Tangents
- approached her surface. She became tensor and tensor. Quite
- suddenly three branches of a hyperbola touched her at a single
- point. She oscillated violently, lost all sense of directrix and
- went completely divergent. As she approached a turning point she
- tripped over a square root that was protruding from the erf and
- plunged headlong down a steep gradient. When she was
- differentiated once more she found herself completely alone, in a
- non-Euclidean space.
-
- She was being watched, however. That smooth operator Curly
- Pi, was lurking inner product. As his eyes devoured her
- curvilinear co-ordinates a singular expression crossed his face.
- Was she still convergent, he wondered. He decided to integrate
- improperly at once.
-
- Hearing a vulgar fraction behind her Polly turned around and
- saw Curly Pi approaching with his power series extrapolated. She
- could see at once by his degenerate conic and his dissipative
- terms that he was bent on no good.
-
- "Eureka!" she gasped.
-
- "Ho,ho!" he said. "What a symmetric little polynomial
- you are. I can see you are absolutely bubbling over with secs."
-
- "O Sir," she protested "keep away from me. I haven't got my
- brackets on."
-
- "Calm yourself my dear," said our smooth operator, "your
- fears are purely imaginary."
-
- "i,i" she thought. "Purhaps he's homogeneous then?"
-
- "What order are you?" the brute demanded.
-
- "Seventeen" replied Polly.
-
- Curly leered, "I suppose you've never been operated on
- yet?" he said.
-
- "Of course not," Polly cried indignantly. "I'm purely
- convergent."
-
- "Come come," said Curly. "Lets off to a decimal place I
- know and I will take you to the limit."
-
- "Never!" gasped Polly.
-
- "EXCHLF!" he swore, using the vilest oath he knew. His
- patience was gone. Coshing her over the coefficient with a log until
- she was powerless, Curly removed all her discontinuities. He
- stared at her significant places and began smoothing her points
- of inflection. Poor Polly. All was up. She felt his hand
- tending toward her asymptotic limit. Her convergence would soon
- be gone forever.
-
- There was no mercy, for Curly was a Heavyside operator. He
- integrated by parts. He integrated by partial fractions. The
- complex beast even went all the way round and did a contour
- integration. What an indignity! To be multiply connected on her
- first integration. Curly went on operating until he was
- absolutely and completely orthagonal.
-
- When Polly got home that evening her mother noticed that she
- had been truncated in several parts. But it was too late to
- differentiate now. As the months went by Polly increased
- monotonically. Finally she generated a small but pathological
- function which left surds all over the place until she was driven
- to distraction.
-
- The moral of our sad story is this: if you want to keep your
- expressions convergent, never allow them a single degree of
- freedom.
-
-
- Reprinted from a 1967 edition of the California Engineer.
-