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Homework Statement
Hey everyone. I'm in an introductory differential equations class, and I think this homework problem has got me stumped.
The functions y1(x), y2(x), ... , yn(x) are linearly independent on an interval I. c1y1(x)+c2y2(x)+...+cnyn(x)=0 for all x in I, implies that c1=c2=...=cn=0. What is the maximum number of functions that can be linearly independent?
y1=1, y2=1+x, y3=x2, y4=x(1-x), y5=x
Me and a friend concluded that this was more of a conceptual question. Since it's already defined as being a set of linearly independent functions, we figured that the max number of linearly independent functions must be "n many functions" since it goes up to cn.
I also tried simply adding all of the functions together and setting it equal to zero, then solving for x. This gave me an answer of -2/3, which clearly isn't a logical answer here.
Am I using the right logic in that this is simply a conceptual question, or am I missing something? Do I need to use the Wronskian or do something otherwise involving matrices? Any help would be very much appreciated. :)