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Pronunciation Guide
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So, what we need is a rigorous airtight mathematical proof, but finding such a proof it turns out, is extremely difficult.
One of the first mathematicians to really try was a 29-year-old Norwegian Viggo Brun.
Brun was working during the early years of the first World War, and with travel disrupted and Europe's mathematical centers largely out of reach,
Listen to native speakers pronounce “viggo” in real conversational contexts with synchronized timestamps and subtitles.