Nachzuweisen

Nachzuweisen is the infinitive with zu of the German verb nachweisen, which means to prove or to establish something by presenting evidence. The related noun Nachweis means proof or evidence. The verb itself combines the prefix nach- with weisen (to show), conveying the idea of demonstrating a fact by providing supporting material.

In formal and technical writing, nachzuweisen appears in impersonal constructions that express a requirement to furnish proof. Typical patterns include Es ist nachzuweisen, dass ... (It must be proven that ...) or Es ist nachzuweisen, welche Voraussetzungen erfüllt sind. The phrase is often used in legal, scientific, and administrative contexts to indicate that a claim or assertion requires demonstration by evidence. Synonyms or closely related terms include belegen, beweisen, and der Beleg.

Grammatically, nachzuweisen is the infinitive with zu used after certain verbs or adjectives in a formal clause, such as in Es ist nachzuweisen, dass ... or Es bleibt zu zeigen, dass ... The finite form can separate the prefix in the present tense: ich weise es nach; in the perfect, it appears as ich habe es nachgewiesen. The noun Nachweis pairs with phrases like der Nachweis wurde erbracht (the proof was provided).

Common usage contrasts with everyday German, where simpler forms like beweisen or belegen are more frequent outside formal texts. In summary, nachzuweisen denotes the act of demonstrating a claim through evidence and is a staple in official, scientific, and legal language.