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Question: select and the use of $

Question:select and the use of $

taro 505
April 29 2014
1

Dear people in mapleprimes,

 

I have a question which is probably very elementary.

> integers:=[10..15]:
> select(isprime, integers);
Then, "Error, selecting function must return true or false" appears.

On the other hand, 

> integers:=[$10..15]:
> select(isprime, integers);

Then , [11, 13] appears.

 

What role does the character "$" play here? 

 Thank you in advance.

 

taro
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