DịCH Vụ Đồ CúNG OPTIONS

⁠ features a cardinality more compact than or equal into the cardinality of A further set ⁠ T displaystyle T The disjoint union of two or maybe more sets is similar on the union, but, if two sets have aspects in widespread, these features are regarded as distinct in the disjoint union. That is received by labelling The weather via the indexes o