1. In law and formal contexts, evidence or documentation that is straightforward and requires no complex interpretation or additional corroboration
The witness testimony served as a simple proof of the defendant's whereabouts.
O depoimento da testemunha serviu como prova simples do paradeiro do réu.
2. In academic or scientific contexts, basic evidence or demonstration that directly supports a claim without elaborate methodology
A simple proof of the theorem was presented in class.
Uma prova simples do teorema foi apresentada em aula.
3. Documentary evidence that is straightforward and self-evident
The receipt was simple proof of purchase.
O recibo era prova simples de compra.