Geodesic
MEASURABILITY OF SOME SETS OF BOREL MEASURABLE FUNCTIONS ON $[0,1]$
Acta mathematica Universitatis Comenianae, Tome 64 (1995) no. 2 
M. Smidek. MEASURABILITY OF SOME SETS OF BOREL MEASURABLE FUNCTIONS ON $[0,1]$. Acta mathematica Universitatis Comenianae, Tome 64 (1995) no. 2. http://geodesic.mathdoc.fr/item/AMUC_1995_64_2_a4/
@article{AMUC_1995_64_2_a4,
     author = {M. Smidek},
     title = {MEASURABILITY {OF} {SOME} {SETS} {OF} {BOREL} {MEASURABLE} {FUNCTIONS} {ON} $[0,1]$},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {1995},
     volume = {64},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1995_64_2_a4/}
}
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Voir la notice de l'article provenant de la source Comenius University

In the paper we show that the space of injective Borel measurable functions and the space of functions, which norm attains supremum at exactly one point, with supremum metric are coanalyticly hard by using the space of trees.