Also means
to prove
Usage Note
Demostrar is an o→ue stem-changing verb (demuestra, demuestras…). It means both 'to demonstrate' (show how something works) and 'to prove' a claim logically or mathematically. The noun form is demostración. Do not confuse with mostrar ('to show'), which lacks the 'prove' sense.
Examples
"El científico demostró su teoría con datos."
Natural Translation
The scientist proved his theory with data.

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