diff --git a/cours/5relations.pdf b/cours/5relations.pdf new file mode 100644 index 0000000..dd133fa Binary files /dev/null and b/cours/5relations.pdf differ diff --git a/td/td4.pdf b/td/td4.pdf new file mode 100644 index 0000000..1d4f738 Binary files /dev/null and b/td/td4.pdf differ