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Calculus Isn’t Accurate Enough

November 12th, 2008 · Comments

In an attempt to save material cost, a coworker was tasked with determining the actual surface area used of a material on one of our products.  Watching him measure a curved surface with a ruler was almost painful so I proposed he cut the film of interest away from the product, mass it, and compare it to the mass of a reference sample.  I was told this was “too inexact” compared to trying to measure a curved, inflated, stretchy surface with a ruler.

He then moved to using CAD to view the device in 3D and started using the ruler functions to again measure the surface and tried cutting the space into smaller geometric figures as the surface of consideration wasn’t quite spherical.  I proposed he use the equation for the surface curve and that he calculate the volume as an a surface of revolution.  Once again, I was rebuffed for it not being exact enough.

Calculus, not exact enough.  The only method for perfectly determining the area under a curve after literally millenia of estimates using stupid rectangular prisms and trapezoids is not exact enough.  A mathematic accurate enough to shoot the Voyager 2 probe within 70 km of Neptune at a distance of nearly 4.5 billion km.  Your right, calculus, not exact enough.  You got me.

Tags: Ghaa...

  • Point of order, calculus is the study of change, in the same way that geometry is the study of space. Calculating surface area is in fact a function of geometry.
  • Definition: I don't believe that "study of change" is an accurate definition of calculus. Your definition appears to ignore all of integral calculus and is also broad enough to make calculus more than a branch of mathematics as the tool box of calculus can't approach many aspects of change.

    By your definitions:
    Under your definitions, calculus is still applicable because it's measuring the change in a function and how that modifies volume, rather than the geometer using successive approximations calculus uses exact measurements, much like trying to determine the area of a circle by straddling it with an (n)-gon and an (n-1)-gon rather than by using an exact calculation.

    It seems by extension that you'd be opposed to the chemist's tool of spectroscopy being used to study stars because they're the domain of astronomy.
  • I bow before you sir, I can not match wits with you.
  • Maybe if NASA were more exact, they wouldn't have such budget issues. To not search for something more precise is loser talk. Plus, how else do you justify spending all that time in order to save pennies on the dollar? Your co-worker just realized they were in way too deep so the only way out was to discover maths more precise than Calculus. I'm sure Convatec would love to have a Nobel Prize on the wall in your lunch room.
  • I'll give you a dollar if you find a Nobel Prize in mathematics.
  • Nice one. I have stumbled and twittered this for my friends. Others no doubt will like it like I did.
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