The paper presents Kotarbinski's reism in two versions: ontological (only things exist) and semantic (abstract expressions have sense only when they can be reduced to concrete expressions). It discusses the relation between reism and other, similar views. It shows the prospects for, and limitations of, the realisation of the semantic reism programme. Finally it responds to main objections to reism, and occasionally shows how these objections can be met in order to defend the reist position.
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