We consider the matching problem with contracts of Hatfield and Milgrom (2005), and we introduce new concepts of bilateral and unilateral substitutes. We show that bilateral substitutes is a sufficient condition for the existence of a stable allocation in this framework. However, the set of stable allocations does not form a lattice under this condition, and there does not necessarily exist a d...

Let R be the pseudovariety of all finite semigroups whose principal right ideals have a unique generator, let L be its dual, and let J = R∩L. Using the word problem for free pro-J semigroups, it is shown that the bilateral semidirect product Sl ∗∗ J is local, where Sl denotes the pseudovariety of all finite semilattices. The global of the pseudovariety R ∨ L is also computed and it is shown tha...

Antepartum mastitis is a rare condition, whereas postpartum or lactation mastitis is a common problem. This report introduces a case of complicated bilateral antepartum mastitis, which was treated successfully by drain insertion and antibiotic therapy. The patient was a 23-year-old woman in the 23rd week of her first pregnancy. Her chief complaint was progressive swelling, redness and radicular...

Neuroblastoma is a common tumor in pediatric cancer and which might present with usual or unusual clinical features. One of the rare clinical finding of neuroblastoma is paraneoplastic syndromes. We report a two year-old girl with presentation of bilateral ptosis and abdominal pain which was diagnosed as having neuroblastoma. Our case is a very rare case of neuroblastoma accompanied by bilat...

post cardiac surgery ophthalmic complications are uncommon, and sudden visual loss is one of the most important ophthalmic problems in these patients. we report a 54-year-old woman that suffered transient sudden bilateral visual loss seven days after orthotopic heart transplantation. in ophthalmologic examination positive findings were bilateral normal size pupils without direct and indirect pu...

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absract a case of 69- year-old woman with large pelvic mass and ascites is reported in this paper. with the exception of mild pelvic pain and a pelvic mass in pelvic , she had no symptom or sign . all routine and hormonal lab tests and tumor marker's were normal. the mri revealed a large mass in anterosuperior of uterus, and left ovary was situated in neighborhood of pelvic mass.her uterus norm...