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What can you ask Wolfram|Alpha about? Mathematics ›. Elementary Mathwhere is the identity matrix.Courant and Hilbert (1989, p. 10) use the notation to denote the inverse matrix.. A square matrix has an inverse iff the determinant (Lipschutz 1991, p. 45). The so-called invertible matrix theorem is major result in linear algebra which associates the existence of a matrix inverse with a number of other equivalent properties.Compute answers using Wolframs breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ...Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly.Note that some authors (e.g., Whittaker and Watson 1990, p. 341) define without the leading factor of .. Erf is implemented in the Wolfram Language as Erf[z].A two-argument form giving is also implemented as Erf[z0, z1].. Erf satisfies the identitiesMathematica Student Edition is a great investment because it will grow with you, and you can use it throughout your student and professional career.wolfram homework help