/sci/ - Science & Math

What is the purpose of harmony? Why playing different notes at the same time sounds better than playing just one note? Aren't harmony and overtones the same? Couldn't you build an instrument that had the same overtones as a harmony?

Can you help me /sci/? What are the components of model? And how are these components reflected on the cumulative hierarchy [math]V_{\alpha}[/math]?

According to Jech a model for a given language [math]\mathfrak{L}[/math] (wtf does that mean?) is composed of a universe [math]A[/math] and an interpretation function [math]I[/math]. I take it the universe is the set [math]V_{\alpha}[/math] itself. But what is the interpretation function? Is it the relation [math]\in[/math]?

Also, wikipedia and other books seem to have different definitions of models.

Help me bros.