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We report a rare case of gastric collision tumour composed of poorly differentiated adenocarcinoma and neuroendocrine carcinoma in a 56-year-old Caucasian male. The tumour was located in the gastric body and, to our knowledge, it is the tenth case described in the literature and the first in Poland. The adenocarcinoma component constituted 20% of the lesion(More)
Mantle cell lymphoma (MCL) is a rare aggressive lymphoid neoplasm occurring in about 3-7 % of non-Hodgkin lymphomas in the United States and Europe. Although lymphomas infiltrations are recognized in about half of post-mortem studies, in available literature we found only eight cases of mantle cell lymphoma with renal involvement. Five of them present MCL(More)
We review our recent results concerning several computer algebra aspects of determining canonical forms, performing a decomposition and deciding the isomorphism question for matrix problems. We consider them in the language of finite dimensional modules over algebra and the language of square block matrices with an action of elements from some sub algebra(More)
Like many malignancies, the development of colorectal carcinoma (CRC) can be considered as an imbalance between the compromised process of programmed cell death (apoptosis) and excessive, uncontrolled proliferation. Several mutations and epigenetic alterations are acquired during colorectal carcinogenesis. These are responsible for the cell cycle(More)
The main ideas of the course are based on the works of D. In fact (to the best of my knowledge), S. A. Ovsienko [O] was chronologically rst author considering inations/deations and classications of (weakly positive/critical) unit integral quadratic forms, in the 1970's (probably also A.V. Roiter). Twenty years later these ideas were generalized in [B][BP2](More)
  • Andrzej Mróz
  • 2016
For standard algorithms verifying positive definiteness of a matrix A ∈ Mn(R) based on Sylvester’s criterion, the computationally pessimistic case is this when A is positive definite. We present an algorithm realizing the same task for A ∈ Mn(Z), for which the case when A is positive definite is the optimistic one. The algorithm relies(More)