5 Avayavas

4 avavyas: The Hindu- Syllogism of Gautama consists of five parts or propositions viz. 1. Pratijna- the promise 2. Hetu- the proof 3. Udaaharana- the illustration 4. Upanaya- the application of the proof 5. Nigamana- the conclusion. These are called the five Avayavas. The western syllogism consists of only three parts of the proposition, namely, the two premises and the conclusion. http://www.mypurohith.com/Ayurveda/Ayurveda1.asp