Looking for a post

I remember a post some time ago where a user was suggesting some libraries that could be made and I said that I could possibly do it. Could somebody find it?
All I remember other than the information given above is that one of the library concepts had differentiation (don't remember if it was symbolic or numerical)

If you remember around which time the post was made, you could use the advanced search to search within a date range.

Ok, I found it by ctrl+f-ing and searching for "help": Declare a local variable using primitive blocks - #26 by programmer_user
Somehow I missed it while scrolling through the "Replies" section in "Activity"

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