PsiVision

Data Mining and Information Retrieval This is a continuation of the blog at http://psivision.blogspot.com. This plone blog should have better capabilities for collecting richer resources.

Deduction, Abduction & Induction — — last modified 2007-10-06 06:58

Wikipedia concisely clarifies the distinction between the `three forms of inference `_:

Semantic & Syntactic Entailment — — last modified 2007-10-06 06:43

**Semantic entailment** is the same as the implication that we have seen earlier. If all truth assignments that satisfy a set of forumulae S also satisfy A, then S semantically entails A. That is, S -...

Calculus of Propositional Logic — — last modified 2007-10-06 07:10

Propositional logic indeed has a calculus which allows us to verify arguments and prove theorems.

Truth Table for Implication — — last modified 2007-10-06 07:14

I was surprised the binary **implication** operator (->), also called the **conditional**, has a truth table, just as the AND and OR logical operators do. It is as follows:

Entailment, Implication, Induction — — last modified 2007-10-06 07:18

What is the difference between **logical** and **semantic entailment**? How is it different from **equality** and **implication**? **Induction**, unlike **deduction**, generates new knowledge, but ...

Human - Computer Agreement — — last modified 2007-10-06 07:19

Speaking with a friend it became clear that there might be a limit to the performance from any computer algorithm aiming to emulate intelligence.

The Geometry of Information Retrieval — — last modified 2007-10-06 07:21

Currently reading through `The Geometry of Information Retrieval `_ which promises a much needed theoretical unification of the **logical**, **probabilistic** and **vector space** models of ...

The Nature of the Problem — — last modified 2007-10-06 07:24

Structured Data ---------------

Partitional or Hierarchical Clustering? — — last modified 2007-10-06 07:26

Previously most work related to clustering in the image domain has been partitional (or fuzzy partitional). I've not yet thought through the merits of hierarchical clustering as applied to the image ...

Truly Unsupervised Clustering Algorithm — — last modified 2007-10-06 07:28

The first problem is the clustering algorithm itself. The most widely used algorithms need to be told how many clusters they are searching for and this means the algorithm is not entirely ...