in this paper, we study fuzzy substructures in connection withhv-structures. the original idea comes from geometry, especially from thetwo dimensional euclidean vector space. using parameters, we obtain a largenumber of hyperstructures of the group-like or ring-like types. we connect,also, the mentioned hyperstructures with the theta-operations to obtain morestrict hyperstructures, as hv-groups...

since the beginning of the presence of the holy qur’an, criticism and rhetoric have received attention in the areas of culture and thought, too. in this respect we can name some literary and rhetorical works like maj?z al-qur’?n by abu ubaydah ma’mar ibn muthann?, ket?b al-fas?hah by abu h?tam sajest?ni, e’j?z al-qur’?n by j?hez basri, naqd al-nathr wa naqd al-she’r by abu al-faraj qud?mah ibn ...

The vertebrate fossil record documents a plethora of transitions between aquatic and terrestrial environments but their causes are still debated. Quantifying the salinity living is therefore crucial for precising sequence ecological transitions. Here, we measured lithium stable isotope composition mineralized tissues (δ7Limt) extant extinct vertebrates from various environments: seawater, fresh...