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Mathematics 9 Online
OpenStudy (anonymous):

A={x|xEN and x < 10}

OpenStudy (amistre64):

i spose you need to define the set?

OpenStudy (amistre64):

well, it is defined as is ... maybe defined in roster form?

OpenStudy (anonymous):

it means x is a natural number and less than 10\ write down the natural number less than 10 natural number alwys positive integer

OpenStudy (amistre64):

natural number has controversy to it. so it has to be author defined. some say N starts at 0, others say it starts at 1

OpenStudy (anonymous):

general definition is it starts with one

OpenStudy (anonymous):

but in some field,,its consider as 0 as start point

OpenStudy (amistre64):

lol, general definition is in controversy. So it has to be author defined for clarity. personally, I like it starting at 1.

OpenStudy (amistre64):

http://www.wolframalpha.com/input/?i=natural+number

OpenStudy (anonymous):

actually zero is included latter in 18th or 19th century ..i dont remember exactly

OpenStudy (anonymous):

yeah its stated their intro of zero in 1968

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