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an extremely promising French mathematician

Evariste Galois (1811–32) was an extremely promising French mathematician however a series of strange events and a tragic early death would conspire to obscure Evariste Galois's talents for many years.

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a French mathematician, who invented the “Galois theory”

Evariste Galois was a French mathematician, who invented the “Galois theory”.

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a French mathematician, who invented the 'Galois theory'

Evariste Galois was a French mathematician, who invented the 'Galois theory'.

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a French mathematician whose work laid foundations for group theory and Galois Theory

Evariste Galois was a French mathematician whose work laid foundations for group theory and Galois Theory.

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a political activist

In Evariste Galois's short life, Evariste Galois not only made important strides in algebra, number theory, and group theory, but Evariste Galois was also a political activist and ended up in jail twice for being a little too outspoken.

the most unfortunate mathematician who ever lived

Evariste Galois was probably the most unfortunate mathematician who ever lived.

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the most unfortunate among all the mathematicians

Evariste Galois was probably the most unfortunate among all the mathematicians.

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the most prolifically collaborative mathematician in history

Indeed, Evariste Galois was the most prolifically collaborative mathematician in history.

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a pioneering figure in the development of abstract algebra

Evariste Galois was a pioneering figure in the development of abstract algebra—basically breaking down algebra into structures.

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a prodigy who solved ancient Greek problems by virtually inventing the branch of Maths called Group Theory

Evariste Galois was a prodigy who solved ancient Greek problems by virtually inventing the branch of Maths called Group Theory.

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