diff --git a/Programmazione Funzionale/2021-04-19 Overriding e singleton.pdf b/Programmazione Funzionale/2021-04-19 Overriding e singleton.pdf
new file mode 100644
index 0000000..5572f5d
Binary files /dev/null and b/Programmazione Funzionale/2021-04-19 Overriding e singleton.pdf differ