Most of the maths here will be in the "folk mathematics" category—the product of someone with good native mathematical ability, but with no mathematical training beyond high school level.
“Started to type in the search item 'five exclamation marks', with the helpful little drop-down...Power of i
“The Fibonacci series of numbers begins as follows: Each term in the sequence is the sum of the...Fibonacci series
“One of the interesting features of the Fibonacci series is the proportion of each term to those...Fibonacci and the golden ratio
“The following table shows terms 0 to 20 of the Fibonacci series. With each nth term is shown the...Fibonacci series and Lucas series
This category has only the following subcategory.
- [×] Imaginary and complex numbers (1 P)