El problema de los universales involucra diferentes áreas temáticas: la psicología cognitiva, la epistemología, y la ontologia, entre otros. El problema de los universales se refiere al modo en que pensamos y percibimos, y cuáles son las realidades a ser conocidas. Se puede ejemplificar el problema de los universales con la siguiente pregunta: ¿es la idea de un río (un universal) más real que las furiosas aguas del Río Meandro (un particular) en este momento? ¿Es menos real? ¿O diferentemente real?

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In metaphysics, the problem of universals refers to the question of whether properties exist, and if so, what they are. Properties are qualities or relations that two or more entities have in common. The various kinds of properties, such as qualities and relations, are referred to as universals. For instance, one can imagine three cup holders on a table that have in common the quality of being circular or exemplifying circularity, or two daughters that have in common being the daughter of Frank. There are many such properties, such as being human, red, male or female, liquid, big or small, taller than, father of, etc. While philosophers agree that human beings talk and think about properties, they disagree on whether these universals exist in reality or merely in thought and speech.

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