Lead to

Systems of Linear Equations	... or Matrices
a₁₁ u₁ + a₁₂ u₂ + a₁₃ u₃ + . . . + a_1n u_n = f₁ a₂₁ u₁ + a₂₂ u₂ + a₂₃ u₃ + . . . + a_2n u_n = f₂ . . . a_n1 u₁ + a_n2 u₂ + a_n3 u₃ + . . . + a_nn u_n = f_n	a₁₁ a₁₂ a₁₃ . . . a_1n a₂₁ a₂₂ a₂₃ . . . a_2n . . . a_n1 a_n2 a_n3 . . . a_nn

Of particular concern are very large matrices whose elements are mostly zero.

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