Upanisads number

[Guest guest]

Pranam to all members!

I had one query:

As you know out of 108+ Upanisads only 11 are considered to be Major

and are studied. These-

Isha,Kena,Katha,Aitreya,Taitreya,Prasno,Mundak,Mandukya,Chandhogya,Briha

daranyak,Swetasvatara.

talk about unity of Brahman and Atman surely but is that the only basis

on which these 11 only been selected for study and what is there in

other Upanisads which are never quoted even? Don't they(rest of

Upanisads) talk of this same Unity?

 

Namaste.