Notes on Saddarsan

prayojananudrsya na mandopi pravartate

Metaphysics, natural philosophy, psychology, eschatology (after-life)
pramana, sambandha, abhidheya, prayojana

Ch. Up. 3.14 world is atman - led to pantheism.

Brhad Up. 
2.4.5 atman is the only reality (result - maya theory)

3.8.11 knowable subject within us

3.4.2 knowing subject, itself unknowable
So Upanisads have the illussory theory about world - to reconcile this idealism 
with practical reality of existence of the world some speculated pantheism, 
brahman entered the world as soul, was introduced. Svetasvatara theism - cit 
acit isvara pantheism resulted in materialism.

Different aspects of Absolute Truth are scattered in the Upanisads here and 
there unchronologically. It is ubsurd to say that what Sankara taught was 
the only doctrine of Upanisads. His is simply a double edged sword to defeat 
non vedic atheism (one edge Vedic, other© atheism).

Buddhism and Jainism are philosophical atheisms. But they raise Buddha and Jina
respectively

SUTRAS 

Gautama    -   Nyaya sutras     -    Prasastapada bhasya
Kanada     -   Vaisesika sutras -    Vatsayana bhasya

Kapila     -   Samkhya sutras   -
Patanjali  -   Yoga sutras      -    
Jaimini    -   Purva mimamsa    -    Sabara Swamin
Vyasa      -   Brahma sutras    -    Vyasa (SB), Sankara, Nimbarka, Visnuswami, 
                                     Ramanuja, Madhva and Baladeva

Sri Madhva (not our acarya!) in Sarva darsana samgraha gives method for 
determining the purport of statements in the Vedic literature:  

upakramopasamharavabhyaso'purvata phalam  
arthavadopapathi ca lingam tatparya nirnaye               

upakrama:    beginning
upasamhara:  end
avabhyasa:   repetition
apurvata:    novelty
phalam:      object
arthavada:   interpretation
upapathi:    argument
lingam:      method, sign
nirnaye:     for determination