Batukari
Batukaria zenbaki batzuen batuketa adierazten duen ikurra da, hizki grekoaz (Sigma maiuskula) irudikatzen dena. Oso erabilia da estatistikan eta matematikan.
Erabilera
Honelakoa da batukari baten adierazpen osotua, bere esanahiarekin batera:
i aldagaiari indize deritzo eta batuketan aurrera egin ahala gehitzen da, bat aldi bakoitzean, m behe mugatik abiatuz eta n goi mugara heldu arte ().
Adibidez, lehenengo 10 zenbaki naturalen batuketa egin behar bada, hau idatziko dugu:
Ohartu behar da ez dela derrigor indizerako i hizkia erabili behar, ohizkoa bada ere:
Batukariaren beste adierazpen batzuk hauek dira, zalantzarik sortzen ez bada modu informalean erabil daitezkeenak :
Propietateak
- k konstante izanik,
- k konstante izanik,
- k konstante izanik,
Ikus, gainera
Kanpo estekak
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