Hi everyone,
 
  
I'm just beginning to learn HOL4. And I have a question.





The problem is as follows: I have a list 'a',
 
I want to use a loop to retrieve the number of 'num' in a each time until the 
list is empty, 


and I see WHILE theorems can be used in the HOL library, but I can not succeed, 


So I would like to ask how to implement the WHILE theorem,
 
if you can, please attach an example to explain. Thank you!






Shang
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