Thursday, December 18, 2014

RM 12.90 Digital Multimeter from Mr DIY

I bought a digital multimeter from Mr DIY which is  in   Tesco Ipoh building  a few weeks ago . It is probably the cheapest one I have ever bought.

I remembered it wasn't long ago when the analog ones cost around RM50.

I bought a handheld digital one a few years back but that one did not last long. I have got a feeling that this one would last longer even though it has only a few days warranty.

 So far I have bought quite a  few things from Mr DIY. The other day someone was asking me at Mr DIY what is good there and I pointed at the multimeter. He sort of looked at me blankly and asked
" What is that ?"

Well, what he was looking for was a remote control for his DVD/VCD player. He wasn't very familiar with the English language as we were actually speaking in Cantonese. So I showed him some of the remotes  which seem to cost around the range of RM 6 to RM10. He wasn't convinced as he thought it could destroy his set.

Anyway I am quite satisfied with the multimeter  I bought  - except for one time when it took some time for the 20V range measurement to work. But it seems to work fine now - just tested it with a 1.5V battery.

Thursday, December 11, 2014

Identifying sequence convergence and divergence

When the degree of the numerator is the same as that of the
 denominator , the sequence converges.

When the degree of the numerator is bigger as that of the 
denominator , the sequence diverges.

A sequence that alternates with positive and negative values 
such as +1 and -1 is not convergent.



\lim_{n\to\infty} \left( 1 + \frac{1}{n} \right)^n.   = e





    Identifying sequence convergence and divergence:




Thursday, December 4, 2014

Radius of convergence

The radius of convergence is 1/2 the length of the interval of convergence.

 http://www.sosmath.com/calculus/radcon/radcon02/radcon02.html

When ratio test =0, the series converges for all real numbers so it has an infinite radius of convergence.


    Radius of convergence using Ratio Test





Wednesday, December 3, 2014

OneRepublic - "I Lived"

This was the number one song in one of the radio channels in Malaysia last week.


Tuesday, November 25, 2014

Tuesday, November 18, 2014

Wednesday, November 12, 2014

One-sided limits from graphs

When approaching from the -ve side, there is a negative superscript for the limit number


    One-sided limits from graphs: