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Question: How to test whether all member in a list are all positive?

Question:How to test whether all member in a list are all positive?

lcz 994 Maple
list
October 10 2019
2

Hello! I want to test a list whether all members in the list are positive. what should I do? for example:

L1:=[1,2,5,6,9]:

so the members in L1 is all positive! so the consequence is true!
L2:=[0,-2,5,6,9]:

It whould be false in my code.
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