document.write( "Question 1137028: List the 4 smallest elements of each set. {y=2x+1, x E(element) natural numbers} \n" ); document.write( "

Algebra.Com's Answer #754875 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "You will be surprised, but even among mathematicians there is no one single canonical definition of what are \"natural numbers\".\r\n" );
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document.write( "The most widely accepted understanding is that they are integer numbers {1, 2, 3, . . . }, starting from 1.\r\n" );
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document.write( "But there are influential mathematical schools and countries (France, for example), where they define natural numbers \r\n" );
document.write( "including 0 (zero) and starting from it.\r\n" );
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document.write( "You can read about it from this Wikipedia article  https://en.wikipedia.org/wiki/Natural_number.\r\n" );
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document.write( "In US and in US schools, the natural numbers are integer starting from  1.\r\n" );
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document.write( "By accepting this definition, the answer to your question is this set {3, 5, 7, 9}.\r\n" );
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document.write( "These numbers correspond to values x= 1, 2, 3 and 4 in the formula  y = 2x + 1.\r\n" );
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