* Introduced Geometric progression
* Fixed some typos and added geometric mean
* fixed some more typos
* Added Design Patterns book
* added design pattern books
Errors fixed, and added a few other minor points to clarify things, some examples, and more rules for differentiation. Also removed hot-linked images since it is sometimes frowned upon (people should not frown upon FCC!) and some don't work anymore.
replace existing text with the following new text "Divide the top of the fraction (the numerator) by the bottom of the fraction (the denominator); then multiply the result by 100 to obtain the number in percentage form. Example: Step 1: 1/4 = .25 Step 2: .25 x 100 = 25% In this example, we have determined that 1/4 equals 25%."
add text "An example of positive correlation would be the relationship between people's height and weight: taller people tend to be heavier. If we look at the average data for a large group of people, as height increases so does weight."
Made clear that an infinite decimal expansion does not mean irrational, then added some history, context for interest and explained that in most computing languages their existence can (ironically) be ignored.
* Unique property of the inverse of the golden ratio
Added a description of how the golden ratio minus 1 is equal to the inverse of the golden ratio
* Fix typo in OP's PR
Explained what an arithmetic series is, gave the formula for the sum (when finite) and gave two proofs (not just induction) as the 'famous' method by Gauss is too elegant to ignore.
Addressed infinite decimal expansions as well since they are just as important and the title doesn't suggest this article is only about finite decimals