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Some interesting blogs and websites These are a small (but growing) list of nonCAC blogs:

By strider, on October 5th, 2011
Tweet For my math class, I was attempting to create a curve sketching question by writing the second derivative as a factorable quadratic, and working backwards to an order4 polynomial. Along the way, I would fill in the missing constant terms by using synthetic division on an arbitrary binomial factor, and striking upon a satisfactory polynomial […] […]
Go to article Nice polynomials, nice polynomials …
By strider, on August 22nd, 2011
Tweet Yesterday, I told another fellow computer geek an ’80s DOS joke about being prompted to “Enter any 11digit 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 […] […]
Go to article How to spend an idle afternoon
By strider, on July 20th, 2011
Tweet I keep saying how much of a fan I am of the RPN mode, and have used it on and off since high school. But times have changed, and HP needs to find a way to manipluate the logic of repeated calculations to make RPN still come out on top, but I feel discouraged, and […] […]
Go to article HP 35s Calculator Annoyances III
By strider, on July 15th, 2011
Tweet I am as much of a fan of the RPN mode as anyone. But the implementation of RPN in the HP calculators have to keep up with new developments in technology. For one thing, I had trouble in RPN mode, to make a list of random numbers. Suppose you wanted to make a list of numbers […] […]
Go to article HP Calculator Annoyances II
By strider, on July 13th, 2011
Tweet I have kept some notes as I was performing an stats operation on a list of numbers. Most of the time the interface on most calculators is intuitive enough that you don’t really need the manual to do things like stats or common operations on the scientific calculator. The Sharp calculator has data entry for […] […]
Go to article More on the HP 35s Calculator
By strider, on March 26th, 2011
Tweet When I comment on technology, I like to discuss the good and the bad about it. I don’t sell calculators, and I don’t get freebies to review. That gives me the freedom to freely comment. One has to admit that for HP to sell a $90 RPN calculator in this age of $20 textbook display calculators […] […]
Go to article What is old is new: RPN on the HP 35s Scientific Calculator
By strider, on February 26th, 2011
Tweet Once upon a time, around the year 525 during the reign of Pope John I, a monk named Dionysius invented the idea of Anno Domini by producing a calendar which marked the time since the birth of Christ. The numbering of the years was adopted for the Julian Calendar, a calendar created 600 years previous […] […]
Go to article Zero
By strider, on February 13th, 2011
Tweet There were some mistakes with the construction of the oddordered magic squares. These mistakes ought to give us hope in finding squares that, if n is odd, you will indeed get (n!)2 magic squares with a random method. I had always maintained that, and until now I never had a reason to question it. And […] […]
Go to article Magic Squares: Errata
By strider, on February 9th, 2011
Tweet Welcome to part 7, where the magic squares are 7×7. I don’t know if there is any numerological significance to that, but it wasn’t intended. Although, if someone wanted to make something of it, 7 was the number of known planets in medieval times, as well as the number of known elements, and the number […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind – Part 7
By strider, on February 5th, 2011
Tweet 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 “hypermagical” properties which I called the […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind – Part 6
By strider, on February 2nd, 2011
Tweet I was experimenting with Danny Dawson’s 4×4 magic square script, and began to consider writing my own script. But I just thought I would do a few runs for my own research. I wanted to thank Mr. Dawson for his fine work which I am obviously gaining knowledge from, but his comments page thought I […] […]
Go to article Recreational Math I: 4×4 squares: Some sequences work better than others
By strider, on January 29th, 2011
Tweet How to Make a Random Square I have noticed that it has been difficult to elucidate a method for systematically creating evenordered magic squares of any but the most basic kind. I don’t know why this is, since the art has been alive in Europe for at least 600 years, and probably longer in other cultures. […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind – Part 4
By strider, on January 26th, 2011
Tweet Notice that to show the rules for making these kind of magic squares, I used only oddordered square matrices as examples. What about matrices of even numbers of rows and columns? The rules for these vary. The famous Durer magic square, with the year of the engraving cleverly made a part of a […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind – Part 3
By strider, on January 22nd, 2011
Tweet Last time I introduced the idea of magic 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 all rows, columns, and diagonals add […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind – Part 2
By strider, on January 19th, 2011
Tweet Introduction ONE OF THE few things you see on the web these days is how to do a really good magic square. There are many websites that tell you about how spiralling arrangements of sequential numbers on a square matrix is magic, but for me, that’s dull. You are limited to doing seemingly less than a […] […]
Go to article Recreational Math I: Magic Squares: the “really good” kind
By strider, on January 14th, 2011
Tweet Maple is a robust math environment which can graph, solve equations, and solve for the unknown with the aid of its computer algebra solver (CAS), which is capable of computing exact roots of cubic functions, for example. I wanted to demonstrate for myself that Maple could do various function transformations, such as: f(x), f(x + 1), […] […]
Go to article Getting f(x) notation to work in Maple
By strider, on April 15th, 2010
Tweet A couple of changes to the programming language, including the addition of a host of commands and libraries, and the Request “x”,y command, have made the programming experience more pleasant on the Nspire. Finally, something that comes a giant step closer to behaving like a normal programming language. The assignment command using “STO>” doesn’t work the […] […]
Go to article The TINSpire Programming Language
By strider, on April 6th, 2010
Tweet 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 […] […]
Go to article Version 2 of the TI Nspire operating system
By strider, on May 2nd, 2008
Tweet 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 tidiedup you then inspect and find the answer incorrect So then you do the question over Once it’s right you then discover You were to do the even […] […]
Go to article My GeoTrig Poem

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