After Abel’s death his Paris memoir was found by Cauchy in 1830 after much searching, It was printed in 1841 but rather remarkably vanished again and was not found until 1852 when it turned up in Florence. Also after Abel’s death unplubished work on algebraic solution of equetions was found. In fact in a letter Abel had written to Crelle on 418 October 1828 he gave the theorem:-
If every three roots of an irreducible of prime degree are related to one another in such a way that one of them may expressd rationally in terms of the other two, them the equetion is soluble in radicals.
This result is essentially identical to one given by Galois in his famous memoir of 1830. In this same year 1830 the Paris Academy awarded Abel and Jacobi the Grand Prix for their outstanding work.