indecomposable

/ˌɪndiːkəmˈpoʊzəbəl/
adjective
  1. Not able to be broken down into simpler parts or elements.
    • The ancient philosopher believed that atoms were indecomposable particles.
    • In chemistry, some elements are considered indecomposable by ordinary means.
    • The mathematician proved that the number was indecomposable into smaller factors.
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