Vectors are equal if they have the same magnitude and direction regardless of where they are. Triangle ABC is isosceles. X is the midpoint of AB, Y is the midpoint of BC and Z is the midpoint of AC.

right)\) Look at the diagram and imagine going from X to Z. How would you write the path in vectors using only the vectors \(\overrightarrow {XY}\) and \(\overrightarrow {ZY}\)? You could say it ...

Scientists spent the next three decades teasing apart the underpinnings of viral biology to create a new generation of vectors. Among these, lentivirus-based vectors, derived from the HIV-1 ...