Comments for Robs Blog http://blog.robertborgersen.info random thoughts, insights, and questions Thu, 08 Jul 2010 19:20:40 +0000 hourly 1 http://wordpress.org/?v=3.0.1 Comment on Participating In #EdChat by Nathan Grimm http://blog.robertborgersen.info/?p=247&cpage=1#comment-2082 Nathan Grimm Thu, 08 Jul 2010 19:20:40 +0000 http://blog.robertborgersen.info/?p=247#comment-2082 Hi, I noticed on your site, Rob's Blog, that you mentioned the #edchat conversation on Twitter. I have found it to be a really helpful resource for networking with educators and learning more about the day-to-day challenges that so many teachers face. There are a few other conversations that I have found helpful as well in more specific areas of education so I made a widget that would combine them all, http://www.widgetbox.com/widget/nathan-grimm-n8ngrimm-on-twitter. Because you mentioned #edchat I thought you might find it a useful widget to post on your page so your readers can view the conversation without having to leave your website. Widget Box makes it pretty easy to install the widget. You just click "Get Widget" in the upper right part of the page, then choose the platform you are publishing on. Let me know if you have any issues with installing it. I hope you like it. (p.s. if you have any suggestions, I would love to incorporate them) Sincerely, Nathan Grimm SR Education Group - Program Manager nathan@sreducationgroup.com Follow me @n8ngrimm (425) 605-8898 123 Lake Street South Suite B-1 Hi,

I noticed on your site, Rob’s Blog, that you mentioned the #edchat conversation on Twitter. I have found it to be a really helpful resource for networking with educators and learning more about the day-to-day challenges that so many teachers face.

There are a few other conversations that I have found helpful as well in more specific areas of education so I made a widget that would combine them all, http://www.widgetbox.com/widget/nathan-grimm-n8ngrimm-on-twitter. Because you mentioned #edchat I thought you might find it a useful widget to post on your page so your readers can view the conversation without having to leave your website.

Widget Box makes it pretty easy to install the widget. You just click “Get Widget” in the upper right part of the page, then choose the platform you are publishing on. Let me know if you have any issues with installing it. I hope you like it.

(p.s. if you have any suggestions, I would love to incorporate them)

Sincerely,

Nathan Grimm
SR Education Group – Program Manager
nathan@sreducationgroup.com
Follow me @n8ngrimm
(425) 605-8898
123 Lake Street South Suite B-1

]]> Comment on Writing Math on the internet! by robertborgersen http://blog.robertborgersen.info/?p=135&cpage=1#comment-2072 robertborgersen Thu, 01 Jul 2010 19:38:20 +0000 http://blog.robertborgersen.info/?p=135#comment-2072 Thanks! Looks very promising! I like the interface, but unfortunately I couldn't get their own sample file to compile...must be a pretty new project...will definitely watch it! Thanks! Looks very promising! I like the interface, but unfortunately I couldn’t get their own sample file to compile…must be a pretty new project…will definitely watch it!

]]> Comment on Writing Math on the internet! by Michael http://blog.robertborgersen.info/?p=135&cpage=1#comment-1975 Michael Fri, 21 May 2010 11:12:53 +0000 http://blog.robertborgersen.info/?p=135#comment-1975 Did you see LaTeXLab http://docs.latexlab.org/? Seems like another option. Did you see LaTeXLab http://docs.latexlab.org/? Seems like another option.

]]> Comment on The Rule of 72 (Investing) by Jason http://blog.robertborgersen.info/?p=185&cpage=1#comment-1832 Jason Wed, 28 Apr 2010 20:10:00 +0000 http://blog.robertborgersen.info/?p=185#comment-1832 = xln(1+1/x) (by property of logarithms) = ln(1+1/x)/(1/x) But this is an intermediate form (0/0) so L'Hospital's rule can be applied. Thus, by L'Hospital's rule, lim(x->inf)ln(y)= lim(x->inf)[[1/(1+1/x)]*(-1/x^2)]/(-1/x^2) = lim(x->inf)[(1/(1+1/x)] = 1 But e^ln(y) = y = f(x) So lim(x->inf)f(x) = lim(x->inf)[e^ln(y)] = e^[lim(x->inf)ln(y)] (since e^x is continuous) = e^1 = e So lim(x->inf)[(1+1/x)^x] = e e is such a beautiful number! = xln(1+1/x) (by property of logarithms)
= ln(1+1/x)/(1/x)

But this is an intermediate form (0/0) so L’Hospital’s rule can be applied.

Thus, by L’Hospital’s rule,

lim(x->inf)ln(y)= lim(x->inf)[[1/(1+1/x)]*(-1/x^2)]/(-1/x^2)
= lim(x->inf)[(1/(1+1/x)]
= 1

But e^ln(y) = y = f(x)

So lim(x->inf)f(x) = lim(x->inf)[e^ln(y)]
= e^[lim(x->inf)ln(y)] (since e^x is continuous)
= e^1
= e

So lim(x->inf)[(1+1/x)^x] = e

e is such a beautiful number!

]]> Comment on The Rule of 72 (Investing) by Jason http://blog.robertborgersen.info/?p=185&cpage=1#comment-1830 Jason Wed, 28 Apr 2010 19:53:10 +0000 http://blog.robertborgersen.info/?p=185#comment-1830 This is really cool Rob! One interesting thing I can add is that e can be defined as the limit of (1+1/x)^x as x approaches infinity. Define a function y = f(x)= (1+1/x)^x Now, take the natural logarithm of both sides, ln(y) = ln[(1+1/x)^x] This is really cool Rob!

One interesting thing I can add is that e can be defined as the limit of (1+1/x)^x as x approaches infinity.

Define a function y = f(x)= (1+1/x)^x

Now, take the natural logarithm of both sides,

ln(y) = ln[(1+1/x)^x]

]]> Comment on The Rule of 72 (Investing) by erauqssidlroweht http://blog.robertborgersen.info/?p=185&cpage=1#comment-1803 erauqssidlroweht Tue, 27 Apr 2010 23:12:22 +0000 http://blog.robertborgersen.info/?p=185#comment-1803 My gr 11 math teacher taught us this when we spent a week doing the entire consumer math curriculum. It is immensely useful. My gr 11 math teacher taught us this when we spent a week doing the entire consumer math curriculum. It is immensely useful.

]]> Comment on Best Credit Cards in Manitoba by robertborgersen http://blog.robertborgersen.info/?p=11&cpage=1#comment-1768 robertborgersen Mon, 26 Apr 2010 21:43:30 +0000 http://blog.robertborgersen.info/?p=11#comment-1768 Never did--the link seems to be dead...don't know if it is still around. Any other comments on the best credit card to get in MB? Never did–the link seems to be dead…don’t know if it is still around.

Any other comments on the best credit card to get in MB?

]]> Comment on Sony AF 75-300mm for $229.99 and finding deals by robertborgersen http://blog.robertborgersen.info/?p=179&cpage=1#comment-1744 robertborgersen Fri, 23 Apr 2010 16:33:33 +0000 http://blog.robertborgersen.info/?p=179#comment-1744 I'm sure you could order and have items shipped as usual, but this would likely cost you the shipping cost. I am hoping they allow free pickup in store. That is what would make this perfect. Rob I’m sure you could order and have items shipped as usual, but this would likely cost you the shipping cost. I am hoping they allow free pickup in store. That is what would make this perfect.

Rob

]]> Comment on Sony AF 75-300mm for $229.99 and finding deals by erauqssidlroweht http://blog.robertborgersen.info/?p=179&cpage=1#comment-1617 erauqssidlroweht Mon, 19 Apr 2010 19:31:51 +0000 http://blog.robertborgersen.info/?p=179#comment-1617 Hey rob! Great tip. I used to buy a bunch of things off of NCIX and TigerDirect but when both my motherboard and PSU were DOA, and it took the better part of 6 months to sort things out, I decided the extra price was worth the convenience of a storefront. A place like this that'll do price matching is awesome. But I have one question: They're located at a place that is very difficult for me to access via my standard transport (the bus). Could I order things from them without having to go to their storefront? Hey rob! Great tip. I used to buy a bunch of things off of NCIX and TigerDirect but when both my motherboard and PSU were DOA, and it took the better part of 6 months to sort things out, I decided the extra price was worth the convenience of a storefront.

A place like this that’ll do price matching is awesome. But I have one question: They’re located at a place that is very difficult for me to access via my standard transport (the bus). Could I order things from them without having to go to their storefront?

]]> Comment on Best Credit Cards in Manitoba by Pimp_Lord69 http://blog.robertborgersen.info/?p=11&cpage=1#comment-1512 Pimp_Lord69 Thu, 15 Apr 2010 16:32:00 +0000 http://blog.robertborgersen.info/?p=11#comment-1512 Did you ever get the details on the MBNA card? Is it 1% on all puchases? Is it as good as it sounds because I'm going to be getting a credit card coming this month, and I'm looking for one that will give some good cash back! Did you ever get the details on the MBNA card? Is it 1% on all puchases? Is it as good as it sounds because I’m going to be getting a credit card coming this month, and I’m looking for one that will give some good cash back!

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