## Articles

igeazle portable/travel desk
It can be used in a variety of settings; its applications are endless.
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Showing articles posted by user AMITAVA (x)
• ### The base of natural logarithm : e

This artice I wrote 6-7 years back, one of the oldest.

I found the derivation of "e" (the slope method) in the following...  more
• ### Investigating gravitational force by a large body on a small body

First I will start with a straight strip with negligible thickness and depth. It has length L and mass per unit length M. The other object has mass "m" and has negligible dimension. The other object lies at a distance R from the strip on a line per...
• ### Circle/Sphere

**This is an article from my personal notebook few years back. Very few read it. As I found this is a right place so thought of sharing it here **
One of the important properties of a circle is that it has minimum boundary length with same area among ...
• ### the standard deviation of the difference(and sum) between two independent populations

Basic formulae:
If a set has N data values, with individual data values denoted by ai (where i is from 1 to N) then mean x = ∑ai/N, variance = ∑(ai – x)2/N, and standard deviation σ = √variance.
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• ### Finite Population Correction for s.d. of sample mean- a derivation

Here we are trying to find out the relation between population standard deviation σ and standard deviation of sample mean s, which is also called standard error.
For a population of N if we take sample size n, then combination of all such ...