MathCamp 4 It is now a tradition that MathCamp spring editions will be held in the beautiful Oasis of El Oued. Poster & Program Schedule Proceedings Some pictures… “Welcome to Mathcamp 4 my beloved children (daughters and sons)… … or precisely to my lecture on GPS…” seems to say Djamel. Moussa was very concentrated on student’s answers… “Ah… these student are of another category… ” he thought! All the participants were very attentive… … including the lecturer himself (Abdelfateh)… but he was rather attentive to the discussion between the participants. We were very lucky to have young and cool lecturers like Samir and Mehdi… Even during “breaks”, all are listening to Ghani talking about mathematics… … Except Khaled and Hamza,… they were not interested about Ghani’s “gibberish”… “We know what he is always claiming: geometry is the heart of mathematics…” they seem to say … Mathcamp is also recreation… … on beautiful sand dunes of El Oued … The organizers, including Messaoud, had made everything authentic… … Even coming within donkey-drawn carriage and inviting the famous local artist “El manaai”… … in the pure soufi hospitality tradition with “khobz El mela” A Mathcamp problem-solving example: “mathematics come before or after art?”… Mehdi cannot deny that he is a fun of El manaai… We have the proof. The “beau gosse” of Mathcamp 4, … Allah y barek fik ou yahefdek Dahmane…