1. Ajdukiewicz 1974:412.
2. A very similar statement appears in Cohen and Nagel 1962:77, where it is said that a syllogistic inference may be interpreted as “a comparison of the relations between each of two terms and a third, in order to discover the relations of the two terms to each other.” This similarity is not surprising, for the tasks of the Aristotelian syllogistic and of the Indian inference are essentially the same, although there are differences in the details of how those tasks are accomplished by the two systems of reasoning.
3. Venn 1894. See especially chapters two, four and five.
4. Cardona 1967:337.
5. Prior 1955:127.