Hobbies
Distinct and Odd Partitions
Euler’s Partition Theorem: The number of distinct partitions of an integer, , is equal to the number of odd partitions of that integer : , for all . Euler gave us a proof which is [more…]
OldTrout
Computing
Computing Partitions
Euler gave us the following recursion formula for via his Pentagonal Number Theorem : Note the generalised pentagonal numbers in the above. Define if and let . This is the formula that [more…]
Arts
Shrove Tuesday
Pancake batter 4 oz plain flour A pinch of salt 2 large eggs 7 fl oz milk 3 fl oz water 2 tablespoons of melted butter A little extra butter for cooking the pancakes. [more…]
Hobbies
Unrestricted Partitions
Some may have noticed that I have been giving a representation of the countdown clock. The first line is the fundamental theorem of arithmetic. That is, every integer can be represented by a unique factorisation [more…]
Hobbies
Euler’s Pentagonal Number Theorem
Euler, : In considering the partitions of numbers, I examined, a long time ago, the expression in which the product is assumed to be infinite. In order to see what kind of series will result, [more…]
Hobbies
Generalised Pentagonal Numbers
We considered the pentagonal numbers which begin : That is : for Now consider the following sequence : which begins at and has a common difference of between the terms. For any arithmetic sequence, we [more…]
Hobbies
On Pentagonal Numbers
Hypsicles of Alexandria (c.190 – c.120 B.C.) gave the following definition of polygonal numbers : If there are as many numbers as we please beginning from 1 and increasing by the same common difference, then, [more…]
Hobbies
The Basel Problem
One sometimes gets very interesting results when one turns divergent sums upside down. The Basel problem was asked by Pietro Mengoli in . He asked what is the exact summation of the reciprocals of the [more…]
Arts
Chaconne
A Chaconne is a dance Viktoria Mullova was/is an asylum seeker from the Soviet Union. OldTrout 2019