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Museum of Imaginary Musical Instruments
The ubiquitous appearance of imaginary instruments in these diverse cultural, historic, and symbolic forms suggests something of the enduring fascination they excite. Like Borges’ dragon, they are “necessary monsters”: we cannot say exactly what they mean, and yet they transfix our minds with powerful symbolic energies and hints of possibilities which we ourselves can only gropingly intuit. We hope that our little museum conveys something of the joy and wonder we experienced in collecting these remarkable artifacts.
museum  collection  imaginary  imagination  instruments  music  musical  instrument  collections 
6 weeks ago by bezthomas
Types of Numbers
Types of Numbers
There are many different types of numbers,

Natural, or counting numbers . These are the first numbers you learn about as a child, perhaps as someone had you count the number of apples in a bag (1, 2, 3, 4, 6, ...). We will refer to this set of numbers as the positive integers.
Whole numbers . This is just the number zero included with the counting numbers (0, 1, 2, 3, 4, ...). We will call this the set of non-negative integers.
Integers . These are the whole numbers, extended to include negative number values (...-3, -2, -1, 0, 1, 2, 3, ...).
Rational numbers . Any number that can be expressed as a ratio of integers, or if you prefer a fraction. This includes all integers and numbers like 2/3, 12/5, -782387/2478923, 0/432, etc.. All rational numbers have a decimal equivalent. For example 11/4 = 2.75, 4/3 = 1.333333..., and 1/7 = 0.14285714285714285... The decimal equivalent of rational numbers always end in a repeating digit, or series of digits. The the three examples just listed, the decimal equivalent of 11/4 ends with a repeating 0, 4/3 ends with a repeating 3, and 1/7 ends with the sequence 14285 repeating forever.
Irrational numbers . Numbers that have a decimal equivalent, however they don't have a repeating digit or series of digits. This also means that one cannot find a ratio of integers that is exactly equal to the number. Common examples of irrational numbers are the square root of 2 and π.
Real numbers . All the rationals plus all the irrationals.
Imaginary numbers . Any real number multiplied by the square root of -1. Often the square root of -1 is referred to as i or j. So an imaginary number can be written as 3.2i or -8.77j. It is OK to use irrational multiplying numbers, so πj is a perfectly reasonable imaginary number.
Complex numbers . Any real number added to any imaginary number, such a 2+3j.
Types  of  Numbers  |  natural  whole  integers  rational  irrational  real  imaginary  complex 
october 2017 by neerajsinghvns
The empty brain by Robert Epstein
"Your brain does not process information, retrieve knowledge or store memories. In short: your brain is not a computer".

Hmmm, missing the wood for the trees somewhat.
brain  ai  ideology  imaginary  via:pierce 
may 2017 by ebx

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