Adding SubsetQ and Delete function #688
Merged
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This PR contains 2 new functions:
Issues: Checked a test case of Delete[] function in both Mathematica 9.0 and 10.0 version and got the output (error message) as below:
Input: Delete[{a, b, c, d}, {1, 2}]
-> Delete:partw: Part {1,2} of {a, b, c, d} does not exist. (Mathematica 9.0)
-> Delete:partw: Part 2 of {a, b, c, d} does not exist. (Mathematica 10.0)
The 10.0 is the later version but the message in this case looks like incorrect. In this implementation, I follow the message of verion 10.0.