1,302 prompts matching "An operation that is associative but not commutative"
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Quiz: Multiplying a matrix by minus one
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Practice: A diagonal matrix
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Practice: Evaluating AB minus BA
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Practice: Turning a minor into a cofactor with the sign rule
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Quiz: Checking a 3 by 3 inverse by multiplication
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Practice: What a singular coefficient matrix says about the equations
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: Checking the solution of three equations by substitution
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Worked Example: The weight of a body as mass times g
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Practice: The parallelogram law of forces
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Quiz: Recovering the original force from its two components
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Practice: Choosing the most convenient pair of directions to resolve along
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Practice: Why the forces must sum to nought in two perpendicular directions
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Worked Example: Drawing the polygon of forces to scale
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Quiz: The coefficient of friction between two surfaces
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Worked Example: The moment of a force about a point on its own line of action
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Worked Example: The total moment of three parallel forces about one end
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Practice: Resolving three forces in two perpendicular directions
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Practice: The probability of at least one success
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Worked Example: Finding a value from a given probability by working backwards
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