How can one build a chord made of 2 notes an octave apart from more basic chords, inversions, and deletions? E.g: a chord made of C-C.
For example, one can smoothen a V7 chord by omitting the 5th and moving the 3rd and 7th down an octave, and to rephrase my question, is it possible to arrive at a chord made of a 1st and an 8th with such transformation?
If not, does that chord have a name? And how does one uses it within a progression?