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If x is an integer, then -x is positive. Is this true or false. If false, give a counterexample.

 Sep 22, 2016
 #1
avatar+14985 
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If x is an integer, then - x is positive. Is this true or false. If false, give a counterexample.

{nl} This is wrong. {nl} All numbers with a minus in front of it are negative.

 

counterexample:

 

x = 3 is a positive integer.  x = - 3.1 is a negative real number.

 

asinus :- ) laugh  !

 Sep 22, 2016
edited by asinus  Sep 22, 2016
edited by asinus  Sep 22, 2016
 #2
avatar+33653 
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If x is a positive integer then -x is negative.  If x is a negative integer then -x is positive.

.

 Sep 22, 2016
 #3
avatar+14985 
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Thank you Alan!

asinus  Sep 22, 2016

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