Relational databases. LAKE PHOTO?
Why are my answers wrong?
Equivalence classes error?
I think I'm making a mistake when it comes to equivalence classes. In the picture you can see what the equivalence class is supposed to be, but the word equivalence immediately makes me think of equivalence relations, which are relations that are simultaneously reflexive, symmetric, and transitive. Here, however, it is stated that the equivalence…
Notion ToDo – Relationship?
So I created a database in Notion with a subject overview. Each subject has its own page in the table. Then I created another database with a to-do list. In this ToDo list I have the name (e.g. "Create index cards") and a "relation" to the subject database, where I can then select the subject…
Why doesn't the sun revolve around the earth, but the earth revolves around the sun?
I mean, you need a reference point to determine movement. But why should the sun be this fixed reference point? Just because the larger system, the solar system, moves around it? Perhaps the solar system also moves in complex orbits around the Earth, because it, too, could have been the fixed point. Although that would,…
When is a relation antisymmetric (order relations)?
Good day, I have a good understanding of reflexivity and transitivity in order relations. However, I have trouble understanding antisymmetry. I have two example tasks: 1. Set M={a,b,c}, relation R={(a,b);(b,c);(c,c)} 2. Set M={a,b,c}, relation R={(a,a);(c,c),(a,b);(b,c);(a,c)} Thank you very much for your answers.
What does left-total mean?
The internet gives me contradictory definitions.
Understand relations, the concept of total and partial order?
Good evening dear community, I'm having a bit of trouble understanding the concepts of partial and total order in the context of relations. I'll try to explain how I understand the concepts: If I'm correct, both partial and total order belong to the so-called order relations. An order relation is characterized by three properties: reflexivity,…
What is meant by relationality?
I've read that it's a human need and has something to do with connection… but I can't imagine what that means.
Explanation and differences of the theories of relativity?
Can you please explain to me what both theories of relativity are about and how they differ? thank you in advance
How big would the smallest particle of an atom be if you enlarged an atom to the size of the universe?
If you were to enlarge an atom to the size of the known universe, how big would the smallest known particle of the atom be?