It is a part of a mathematical object which does not change when the object undergoes a transformation.
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If the coefficients of the linear differential equation are dependent on time, then it is time variant otherwise it is time invariant. E.g: 3 * dx/dt + x = 0 is time invariant 3t * dx/dt + x = 0 is time variant
a point on a graph where if the graph is transformed the point stays the same.
they all add to 360 degrees and opposite angles are the same
Mathematics"mathematics" is a plural noun already, the subject is Mathematics!
mathematics