error in 4th order runge kutta method is of the order of
Runge–Kutta methods The RK4 method is a fourth-order method, meaning that the local truncation error is on the order of   O ( h 5  )  {\displaystyle O(h^{5})} , while the total accumulated error is on the order of   O ( h 4  )  {\displaystyle O(h^{4})} .
A Short Walk in the Hindu Kush A Short Walk in the Hindu Kush is a 1958 book by the English travel writer Eric Newby. It is an autobiographical account of his adventures in the Hindu Kush, around the Nuristan mountains of Afghanistan, ostensibly to make the first mountaineering ascent of Mir Samir. Critics have found it comic, intensely English, and understated. It has sold over 500,000 copies in paperback.[1]