Who discovered the first exoplanet?

Answer 1

I would say Adriaan van Maanen in 1917.

The object known as Van Maanen's Star was not identified as an exoplanet in 1917, but subsequent spectral analysis and interpretation in 1990 suggested that it might be one.

You might find this paper interesting:

This link will take you to an article on articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1990ApJ...357..216G&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf.

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Answer 2

Josiah Adams

The first confirmed detection of an exoplanet was made by astronomers Aleksander Wolszczan and Dale Frail in 1992, around the pulsar PSR B1257+12.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.