A. Muslim mathematicians introduced algebra into the world
B. Ibn Sina collected medical knowledge into a book that was used for centuries in Europe
<h2>Explanation:</h2>
Algebra was first developed by the ancient Babylonians and remained dominant up to the 16th century. Muhammad ibn Musa al-Khwarizmi who was a 9th-century Muslim mathematician and astronomer is known as the "father of algebra". The word "Father of Algebra" was derived from the title of his book, Kitab al-Jabr.
Ibn e Sina is commonly known as Avicenna in european countries is considered as one of the most famous and influential scientists in the history of medicine. Ibn-Sina wrote a complete section about kidney calculi in his book. He wrote a lot of books but the best known book of his work is The Canon of Medicine which is his most celebrated book in medicine. This book provides a summary of all the medical knowledge of his time.
appointment of a particular Government servant to a post was erroneous or not ... ability of the candidates under consideration. ... to be followed in such cases will be as given below.
Well based on the fact that the very first patented rock crushing machine was made in the year 1830, and the first successful, Eli Whitney Blake's, was in 1858, I'd say the development process was around 30 years.
