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Some terms in the English language may be somewhat misleading for example a white lie Right now you might be thinking How can a lie be white In the English language it is a lie that is intentioned to help in a good way but is not the truth The same applies to many other words like imaginary numbers and real numbers An imaginary number doesnt mean a non-existent number and a real number doesnt necessarily mean an existing number or maybe it does in the sense that it really is a number Imaginary numbers are no less real than real numbers Imaginary numbers are numbers that can be written as a real number times i The term imaginary probably came from the fact that there is no real number that when squared equals one What is i Its the square root of -1 It seems weird to imagine any number having a negative square Though it seems impossible it really does exist in a number system called the Complex Number System i was invented because people wanted to be able to take square roots of negative numbers and you cant do that if you only limit yourself to real numbers Real numbers are composed of two categories rational and irrational numbers A rational number is a number that can be expressed as a fraction for example 34 On the other hand an irrational number is a number that cannot be expressed as a fraction but as a decimal For instance pi Its a continuous decimal that cannot be put into a fraction Since i is not a rational or irrational number then it is also NOT a real number The English language can lend itself to be used for other purposes When you first heard about a white lie you were thinking about it using the English way only because it has nothing to do with mathematical or scientific description but with an imaginary
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