Up Sah 19.20 to 19.22 have been inter-alia discussed here. It requires fine tuning. Hence this post.                                                                                                                    Upadesha SahAsri 19.20 discusses the status of duality. It has neither birth nor absence of birth. Both have contradictions as explained below. Thus, duality is neither existent nor non-existent. It is neither real nor unreal. In VedAntic terminology, it is mithyA.
1 Suppose there is birth of duality, i.e., there is a cause of its birth. It may be an existent cause or a non-existent cause. A non-existent cause is a non-starter and cannot give rise to an effect. An existent cause can be either (a) non-duality or (b) duality.
(a) The cause cannot be non-duality, because the nature of non-duality is changelessness.
(b) If there is birth of duality A from duality B, then there is a question of birth of duality B and so on. It leads to infinite regress which is logically unacceptable.

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