This 3 sentence summary provides the essential information from the document: The document appears to be from a student notebook recording a class period at the Instituto Polit辿cnico Nacional's CECyT No. 11 "Wilfrido Massieu". It identifies the student as Mart鱈nez Osnaya Jazm鱈n, the teacher as Hern叩ndez Hen叩ndez Gonzalo, and the class as 5IV18 for the period labeled "PERIOD 2".