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Date: 24-5-2021
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Date: 7-8-2021
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Date: 25-6-2017
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A homology class in a singular homology theory is represented by a finite linear combination of geometric subobjects with zero boundary. Such a linear combination is considered to be homologous to zero if it is the boundary of something having dimension one greater. For instance, two points that can be connected by a path comprise the boundary for that path, so any two points in a component are homologous and represent the same homology class.
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دخلت غرفة فنسيت ماذا تريد من داخلها.. خبير يفسر الحالة
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دراسة: الفئران تستخدم "قبلة الحياة" لإنعاش أقرانها
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أصواتٌ قرآنية واعدة .. أكثر من 80 برعماً يشارك في المحفل القرآني الرمضاني بالصحن الحيدري الشريف
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