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# How do I tell WolframAlpha which variables are real and which are natural?

Posted 11 years ago
 Dear WolframAlpha Community,How does one declare that a variable is real and two other variables are natural numbers?I would like to work with this complex fraction:(1-e^(2 i pi (-j+l+t)))/(1-e^((2 i pi (-j+l+t))/n))and its modulussin^2(pi t) csc^2((pi (-j+l+t))/n)In the exponents, i = sqrt(-1); t is real; n, l, j are natural numbers; l and j are less than or equal to n.I could not find answers in WolframAlpha when I searched.Thank you!
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Posted 4 years ago
 In Wolfram Language 12 or later, you can also use PositiveIntegers, i.e., Element[n, PositiveIntegers]. https://reference.wolfram.com/language/ref/PositiveIntegers.html
Posted 11 years ago
 Thank you!
Posted 11 years ago
 Hi Aaron,If Wolfram Alpha is struggling to parse your query you can often use simple Wolfram syntax instead. To say n is a natural number in Mathematica you typically do something like:Element[n, Integers] && n > 0Check these documentation pages for more information.Assumptions and DomainsSimplifying with AssumptionsUsing Assumptions
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