The Cārvāka school (also known as Lokāyata) is the only fully materialist and skeptical school in Indian philosophy.
Core Tenet: Perception (Pratyakṣa) is the only valid source of knowledge (pramāṇa).
Cārvāka's metaphysics (theory of reality) flows directly from its epistemology. If perception is the only source of knowledge, then only perceivable things are real.
Jainism presents a realistic and relativistic philosophy. Its metaphysics is called Anekāntavāda.
Anekāntavāda: The "Doctrine of the Many-sidedness of Reality."
Syādvāda is the Jaina theory of knowledge. It is the epistemological and logical application of the metaphysical doctrine of Anekāntavāda.
Syādvāda: The "Doctrine of 'May-be'" or the "Theory of Conditional Predication."
This leads to the Saptabhaṅgī-naya, or the "Seven-fold Scheme of Predication."
| Predicate | Meaning (Example: A pot is in the room) |
|---|---|
| 1. Syāt asti | "From a certain standpoint, it is." (e.g., ...in this room, at this time). |
| 2. Syāt nāsti | "From a certain standpoint, it is not." (e.g., ...in the garden). |
| 3. Syāt asti ca nāsti ca | "From a certain standpoint, it is and it is not." (e.g., ...in this room, but not in this garden). |
| 4. Syāt avaktavyaḥ | "From a certain standpoint, it is indescribable." (e.g., its "is-ness" and "is-not-ness" cannot be said at the same time). |
| 5. Syāt asti ca avaktavyaḥ | "From a certain standpoint, it is and is indescribable." |
| 6. Syāt nāsti ca avaktavyaḥ | "From a certain standpoint, it is not and is indescribable." |
| 7. Syāt asti ca nāsti ca avaktavyaḥ | "From a certain standpoint, it is, it is not, and is indescribable." |