Display a linear combination: Difference between revisions

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 The purpose of this task is to display a finite [[wp:linear combination|linear combination]] in an infinite vector basis <math>(e_1, e_2,\ldots)</math>.
-Write a function that, when given a finite list of scalars <math>(\alpha^1,\alpha^2,\ldots)</math>, creates a string representing the linear combination <math>\sum_i\alpha^i e_i</math>
+Write a function that, when given a finite list of scalars <math>(\alpha^1,\alpha^2,\ldots)</math>, creates a string representing the linear combination <math>\sum_i\alpha^i e_i</math> as a string in an explicit format often used in mathematics, that is:
-The string should have an explicit format often used in mathematics, that is <math>\alpha^{i_1}e_{i_1}\pm\alpha^{i_2}e_{i_2}\pm\ldots</math> where <math>\alpha^{i_k}\neq 0</math>
+:<math>\alpha^{i_1}e_{i_1}\pm|\alpha^{i_2}|e_{i_2}\pm|\alpha^{i_3}|e_{i_3}\ldots</math>
+where <math>\alpha^{i_k}\neq 0</math>
 In other words, and with examples and counter-examples, your output must comply to the following rules: