This book deals with the development of Diophantine problems starting with Thue's path breaking result and culminating in Roth's theorem with applications. It discusses classical results including HermiteâLindemannâWeierstrass theorem, GelfondâSchneider theorem, Schmidtâs subspace theorem and more. It also includes two theorems of Ramachandra which are not widely known and other interesting results derived on the values of Weierstrass elliptic function. Given the constantly growing number of applications of linear forms in logarithms, it is becoming increasingly important for any student wanting to work in this area to know the proofs of Bakerâs original results. This book presents Bakerâs original results in a format suitable for graduate students, with a focus on presenting the content in an accessible and simple manner. Each student-friendly chapter concludes with selected problems in the form of âExercisesâ and interesting information presented as âNotes,â intended to spark readersâ curiosity.