Abstract We show that taking together the principle ‘Ought’ Implies ‘Can’ (OIC) and The Knowledge Norm of Assertion (KNA) leads to a contradiction as long as we assume that there are situations in which we ought to assert what we cannot know. We call this The Paradox of Impossible to Know Assertion (PIKA) and argue that this is a genuine problem. At the end, we point out a generalization of PIKA.

Rafał Palczewski

Patryk Popławski

Acta Analytica

Acta Analytica is an international journal for philosophy in the analytical tradition covering a variety of philosophical topics including philosophical logic, metaphysics, epistemology, philosophy of science and philosophy of mind. Special attention is devoted to cognitive science. The journal aims to promote a rigorous, argument-based approach in philosophy. Acta Analytica is a peer reviewed journal, published quarterly, with authors from all over the world.

Acta Analytica is an international journal dedicated to philosophy in the analytical tradition, covering a wide range of topics including philosophical logic, metaphysics, epistemology, philosophy of science, and philosophy of mind. The journal places special emphasis on cognitive science and aims to promote a rigorous, argument-based approach in philosophy. Acta Analytica is a peer-reviewed journal published quarterly, featuring authors from around the globe.

《Acta Analytica》是一本国际性期刊，专注于分析传统哲学，涵盖哲学逻辑、形而上学、认识论、科学哲学和心灵哲学等多个主题。期刊特别关注认知科学，旨在推动哲学中基于严谨论证的方法。《Acta Analytica》是一本经过同行评审的期刊，季度出版，作者来自世界各地。

Category	Quartile
文学	3
文学, 哲学	3

The Paradox of Impossible to Know Assertion

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