Dear Yajvan,
Vedanta sees Brahman as the ultimate reality, the word Brahman literally means that which is on the constant process of growth or that which is all-inclusive is also significant.
Hence the upadana(the material) of the world remains Brahman itself.
Now we see it in the light of a classical example in Vedanta that is the pot and the clay
In the case of clay shapes, clay remains the material forming it.
In order to separate out various shapes and to communicate to others, we formulate names for each shape as
pot,
cup,
vessel, vase etc.
The existence of the clay is irrefutable, we see it, and we experience it, it is not unreal. What unreal in the current situation is the names and forms assumed out of the clay material.
This unreality is of an epistemological one. Not ontological.
Ontologically clay alone exists, epistemologically pot exits.
This stand of Vedanta is known as Sat-karana vada( the theory that cause alone is real).
The causal substance in the case of this apparent world is Brahman, thus Brahman alone has real existence; all that appears as the world is nothing but various apparent names forms superimposed on Brahman.
What mithyā is the names and forms, not Brahman is thus made clear.
I guess this meets the ideas offered in the Sastras too.
Vednata uses the terminology Brahman, the terminology of the principal Upanishads where KS make use of the word Siva from its agama pramanas.
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Note for others: A clear understanding of what cause is and what effect is warranted in order to perceive the idea in full strength for contemplation.
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Love
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