Menu
In the attached picture there's a symbol I don't understand. To understand additive functional dependency I need to know what the symbol means. Please advice?
It's the symbol where it says: "Suppose that X ⊇ Y and that..."
⊇ = ?
Thanks!
358
The symbol "⊆" means "is a subset of". The symbol "⊂" means "is a proper subset of". Example. Since all of the members of set A are members of set D, A is a subset of D. Symbolically this is represented as A ⊆ D.
We use the symbol ⊆ to say a set is a subset of another set. We can also use ⊂ if it is a proper subset. The symbols ⊃ ⊇ are opposite - they tell us the second element is a (proper) subset of the first.
This symbol is used in set theory to say that X is a superset of Y, ie. All elements of Y are contained within X. Note that X could be equal to Y in this meaning. Without the underlining on the symbol Y would be a strict subset of X meaning they cannot be equal
136
It means "X is a superset of Y". The subset symbol is the same but flipped horizontally.
39
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
