In mathematics, an abelian category is a category in which morphisms and objects can be added and in which kernels and cokernels exist and have desirable properties.
例如一個22歲開始工作的人,到65歲才退休,工作43年,退休前60個月的投保薪資是最高級距4萬5,800元,若65歲退休就開始請領,每個月能領3萬0,526元,不過若能等到70歲才請領,每個月就能領到3.6萬元;如果想要月領4萬元,則必須勞保不退保,持續加保至70歲,就能每月領到4萬元老年年金。
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