What specific area did mathematicians often focus on first when initially reviewing Zhang's work related to the RH?

Answer

His arguments concerning the Landau–Siegel zeroes.

Mathematicians quickly worked to verify Zhang's claims by often starting by focusing on whether his arguments concerning the Landau–Siegel zeroes were sound, due to their deep linkage to the RH.

What specific area did mathematicians often focus on first when initially reviewing Zhang's work related to the RH?
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