Kaivalya (detachment, isolation) Ashtanga yoga

Liberation (Moksha), detachment, Prakriti, Purusha, Jivanmukti (Yoga Sutras / Bhagavad Gita)

Yoga Sutras of Patanjali and the Bhagavad Gita (Sadhana Pada, Vibhuti Pada, Samadhi Pada)

The Kaivalya Pada of the Yoga Sutras of Patanjali describes liberation, that is when the Seer has managed to completely isolate himself from the disturbances of the mind. In the Bhagavad Gita this state is called Moksha.

Kaivalya (solitude, detachment, isolation) defines the ultimate goal of Ashtanga Yoga. That is, it is the isolation of Purusha from Prakriti and the Gunas, thus the Jivanmukti s freed from Samsara (cycle of birth and death) and achieves the Moksha of the Bhagavad Gita, liberation, and becomes Videhamukti.

Attachment (Vairagya) in the Yoga Sutras of Patanjali is one of the key elements to achieving liberation. Detachment has to be both towards material possessions and that generated by the pleasures of the ego.

Detachment from the fruit of actions is also fundamental in the Bhagavad Gita:

You only have the right to Work, not its fruits. Gita 2-47 (Sankhya Philosophy of Yoga)
Karma Yoga Doctrine

The Bhagavad Gita-Shastra is Yoga. Bhagavad Gita is Yoga-Shastra

Let us remember that the Bhagavad Gita is a Moksha Sastra, and therefore an authoritative text on Moksha: The elimination of ignorance, self-knowledge, the liberation of the soul, and finally the Union with the Absolute.

The Kaivalya Upanishad is considered one of the minor Upanishads of Hinduism, and is part of Vedanta.

Bhagavad Gita in Spanish Kaivalya.