Comments for Division by Zero http://divisbyzero.com A blog about math, puzzles, teaching, and academic technology Thu, 23 Feb 2012 00:33:32 +0000 hourly 1 http://wordpress.com/ Comment on Fallacies, Flaws, and Flimflam it’s been good to know ya by Dave Richeson http://divisbyzero.com/2008/12/18/fallacies-flaws-and-flimflam-its-been-good-to-know-ya/#comment-4431 Thu, 23 Feb 2012 00:33:32 +0000 http://divisbyzero.wordpress.com/?p=326#comment-4431 Exactly. That’s what makes this funny. :-)

]]> Comment on Fallacies, Flaws, and Flimflam it’s been good to know ya by Stephen http://divisbyzero.com/2008/12/18/fallacies-flaws-and-flimflam-its-been-good-to-know-ya/#comment-4430 Wed, 22 Feb 2012 23:12:58 +0000 http://divisbyzero.wordpress.com/?p=326#comment-4430 22/7 and pi are extremely close, but they are not equal.

]]> Comment on Parametric curve project for multivariable calculus by Dave Richeson http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4428 Wed, 22 Feb 2012 18:37:22 +0000 http://divisbyzero.com/?p=3781#comment-4428 That’s a good idea. I didn’t know if you could restrict the domain for ordinary functions, but after a little thinking I figured out how to do it. You create a piecewise function with only one condition. So, for example, to restrict y=x^2 to x\in[0,2] you could enter y=\begin{cases}x^2 & x>0 \text{ \& } x<2\end{cases}.

]]> Comment on Parametric curve project for multivariable calculus by dwees http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4427 Wed, 22 Feb 2012 16:52:15 +0000 http://divisbyzero.com/?p=3781#comment-4427 Yes, true, but for a non-parametric function, this is the role of the domain and range of the function. Maybe working on an assignment like this would give students a more intuitive sense of domain and range?

]]> Comment on Parametric curve project for multivariable calculus by Dave Richeson http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4426 Wed, 22 Feb 2012 13:04:07 +0000 http://divisbyzero.com/?p=3781#comment-4426 You could use it for other types of graphs, but the good thing about parametric curves is that you can easily get segments of curves.

]]> Comment on Parametric curve project for multivariable calculus by Dave Richeson http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4425 Wed, 22 Feb 2012 12:40:15 +0000 http://divisbyzero.com/?p=3781#comment-4425 Perhaps inspired by (although I didn’t see them on the web looking for it), but definitely not plagiarized. I saw them putting it together one curve at a time in lab.

]]> Comment on Parametric curve project for multivariable calculus by dwees http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4424 Wed, 22 Feb 2012 09:01:57 +0000 http://divisbyzero.com/?p=3781#comment-4424 I really like this idea. You could potentially use it for any type of graphs, couldn’t you? The idea being, using the software, students get some intuitive sense of how the graphs work. I suppose one could graph the equations by hand, but the difficulty with errors in graphing could negate the usefulness of the activity.

]]> Comment on Parametric curve project for multivariable calculus by Noyb http://divisbyzero.com/2012/02/21/parametric-curve-project-for-multivariable-calculus/#comment-4423 Wed, 22 Feb 2012 06:24:21 +0000 http://divisbyzero.com/?p=3781#comment-4423 I’ve seen the “Batman Equation” (aka Batman Curver) multiple times before. Are you sure that wasn’t plagiarized, or at least insprired by the work of another?
http://mathworld.wolfram.com/BatmanCurve.html

]]> Comment on A pyramidologist’s value for pi by Panagiotis Stefanides http://divisbyzero.com/2011/04/27/a-pyramidologists-value-for-pi/#comment-4272 Mon, 06 Feb 2012 13:22:52 +0000 http://divisbyzero.com/?p=3601#comment-4272 However,

Please refer to :

http://www.stefanides.gr/Html/gmr.htm

http://www.stefanides.gr/pdf/BOOK%20_GRSOGF.pdf

http://www.stefanides.gr/html/Root_Geometries.htm

http://www.stefanides.gr/html/All_triangles_derive.htm

Regards,

Panagiotis Stefanides

]]> Comment on Interesting approximations using trigonometry by batbrat http://divisbyzero.com/2010/02/16/interesting-approximations-using-trigonometry/#comment-4271 Mon, 06 Feb 2012 11:50:42 +0000 http://divisbyzero.wordpress.com/?p=2666#comment-4271 No problem. :)

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