The Peirce project (named after Charles Sanders Peirce) is an international collabora-tive project aiming to construct a freely available conceptual graphs workbench to support research in the conceptual graphs community in areas such as natural language processing, enterprise modelling, program speciication and veriication, management information systems , conceptual information retrieval, med...

Our motivation is to derive the Drazin inverse matrix modification formulae utilizing inverses of adequate Peirce corners under some special cases, and a with an additive perturbation. As applications, several new results for expressions modified matrices A ?? CB CDdB are obtained, well known in literature, as Sherman-Morrison-Woodbury formula Jacobson?s Lemma, generalized.

Percutaneous venous and retrograde arterial catheterization by the Seldinger technique (Seldinger, 1953), or its modification, is a routine procedure in many cardiovascular diagnostic and research laboratories. The incidence and nature of complications after these procedures vary from one group of investigators to another. Reports and reviews of such complications are available (Peirce, I95I; P...

Di(4-nitrobenzoyloxy)iodo]benzene (1), a hypervalent iodine compound, is easy to prepare and stable as solid, was shown be useful functional group transforming agent in this report. Oxidative synthesis of symmetrical disulfides from thiols the presence compound 1 alone performed 58–100% yields. Furthermore, ESI-MS demonstrated that premixing Ph3P yields corresponding acyloxyphosphonium, which c...

Page 1 of 10 Jon Dorbolo © 1995 Analogue An analogue is an equivalent or counterpart in an analogy. When President Bush said that "Saddam Hussein is another Hitler" he was claiming that the President of contemporary Iraq is the analogue of the Fuhrer of WWII Germany. Whether such comparisons are strong and reasonable is a matter for logical analysis. What matters here is that Peirce is providin...