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Question: imaginaryunit don't work with restart

Question:imaginaryunit don't work with restart

Jodelkoenig 5 Maple 2017
interface imaginaryunit
January 24 2019
1

If I add "restart" to a program, then interface(imaginaryunit=j) don't work. Why? 

***********************************
restart;
interface(imaginaryunit = j);
j^2;
************************************
The output is j^2  but the output should be -1. 

 
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