Dear friends of MHF

in the two and half years of my presence in MHF, I often noticed some difficulties in the treatment of difference equations, an important chapter of Discrete Maths that [may be...] is a little unfairly undervaluated. After a discussion about that with the staff, I decided to write a tutorial on the Difference equations and in next posts You can read thedraftofPart I:general concepts about sequences and first order difference equations, which for size reason has been devided in three parts...

I will appreciate very much all the errors, omissions, modifications, suggestion and requests of clarification that You all will express about my work...

Kind regards