back substitution
A major player in the field in question: someone who is in the big time
(linear algebra) A method of solving linear systems that have been transformed into row echelon form. / (combinatorics) A method of solving recurrence relations.
sunlight reflected from the Earth's surface
(inorganic chemistry) The cation, protonated acetylene (C₂H₃⁺)
行列を階段形に変形した後、最後の式から順に変数を求める後退代入法を用いて解を求めました。
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