Relational Algebra Parameters and Recursive Closure Operations

In relational algebra, what do "parameters" on the left side mean, such as in recursive closure operations?

example:
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JCW2Asked:
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derekkrommConnect With a Mentor Commented:
I'm pretty sure you can just think of them as variables

So the first 2 lines define what BORG_SSN and SUPERVISION are, and then the RESULT1 is a join on those 2 result sets
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JCW2Author Commented:
Thank you for your help.
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