We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.

Here is my stab at the logic, derived from giyam's answers below and Googling set notation:

Give me the set of x such that for all y in set(x) and set(y) is a function of (where) y <= x

However, I think the italicized section above is unclear due to the nature of the problem as it is written...that is, what is the relationship with y and 'S(x)' after ∀?

## Databases - Relational Calculus

You are viewing a single comment's thread. Return to all comments →

Here is my stab at the logic, derived from giyam's answers below and Googling set notation:

Give me the set of x such that for all yin set(x) and set(y)is a function of (where) y <= xHowever, I think the italicized section above is unclear due to the nature of the problem as it is written...that is, what is the relationship with y and 'S(x)' after ∀?

Definitions:

∀ = forall(https://en.wikipedia.org/wiki/Turned_A)| = such that(https://en.wikipedia.org/wiki/Set-builder_notation)∧ = logical conjunction (and)(https://en.wikipedia.org/wiki/List_of_logic_symbols)→ = is a function from(https://math.stackexchange.com/questions/1740154/different-arrows-in-set-theory-rightarrow-and-mapsto)