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How to spend an idle afternoon

Yesterday, I told another fellow computer geek an ’80s DOS joke about being prompted to “Enter any 11-digit prime number and press ENTER to continue.” She then suggested that a number with 11 1’s might be prime. Having encountered this before in programs I’ve written, I warned her that you can’t assume all sequences of […]

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The Psychology Contrarian I: The obsession with IQ

When there are no serious researchers that would place any relevance on IQ and what it measures (indeed, what exactly is it measuring is itself a mystery: does intelligence even have a definition, or am I missing out on something?), I wonder why there are web sites which even go so far as to go […]

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Recreational Math I: Magic Squares: the “really good” kind – Part 6

I have met with some disappointment as to how a methodology for creating a 4×4 square should pan out, and instead I have come up with many different algorithms, each resulting in its own small sets of magic squares, but had stumbled upon a set of squares with similar “hyper-magical” properties which I called the […]

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Recreational Math I: Magic Squares: the “really good” kind – Part 2

Last time I introduced the idea of magic buy tramadol online cod overnight squares. I promised I would show you how to make one. In this post, I will begin by discussing “trivial” squares, or squares made by simple rules of following diagonals and wrapping.

When I say a square is “magic”, I mean that […]

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Version 2 of the TI Nspire operating system

My main complaint about the Nspire and Nspire CAS, the need to have some kind of input statement in its programmnig language, looks like it is closer to reality. I just have to fiddle with it some more to see if it can really place data in tables (or now, spreadsheets), and see if I […]

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Crappy Album Covers #190 — I Can’t Count

Hiroshi Uchiyamada (1936-2006) and The Cool Five are a Japanese group that proves that not knowing how to count is not merely a symptom of brainless white North American schoolchildren anymore, if it ever was. Determined to smash through Oriental stereotypes (after we sing a tune, join us for some Calculus!), the Cool Five […]

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Programming on the TI-84, Nspire and Nspire CAS

The TI-Nspire comes with a great deal of programming tools, but after many updates, it is still crippled by the lack of an input statement.

Without input, what you have is a collection of functions. You have to run and re-run functions with new parameters each time to enter a list.

Of course they provide […]

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Binary adding machine using marbles

My marble adding machine in action. More at http://woodgears.ca/marbleadd

What impressed me is not just the fact that it looks like it could be used as 1) a great woodworking project, and 2) a great computer science tool in grade 10.

There is another video that explains the mechanics behind this adding machine a […]

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The TI-Inspire is not what it is cracked up to be

This is the TI-Nspire, the calculator that promises to foment lazier minds in students than ever before. I teach math, and I look at all these new calculators with jaundiced eye. Ever see the new caclulators these days (non-graphing) which can come up with exact answers to sum and difference functions of trig angles? This […]

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Threes (by John Atherton)

I think that I shall never c A # lovelier than 3; For 3 < 6 or 4, And than 1 it’s slightly >. All things in nature come in 3s, Like ∴, trio’s, Q.E.D.s; While $s gain more dignity if augmented 3 x 3 —

A 3 whose slender curves are pressed By banks, […]

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My Geo-Trig Poem

You take tan b and × sin(cos(q+y)) and just to make it more complex ÷ cot(Δx) And so then by csc(Θ) × angles π, ρ, η and show that they continue on by proof with δ – ε.

Once tidied-up you then inspect and find the answer incorrect So then you do the question over […]

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