I've got a question about linear relations in predicate logic.
I've got the follow definition where R is a relation of x has a Relation to y.
$$\forall x \forall y(Rxy \vee x = y \vee Ryx)$$
How do I read this? Are there 3 formulas? Or just 2?
Also, what would be the correct answers to the question: Do the following sentences describe a linear relation?
(1) being an ancestor of . . . on the set of human beings, (2) being a parent of . . . on the set of human beings, (3) the ‘less than’ relation < on the natural numbers,
My answers would be False,False, False.
Thanks in advance, Rope.