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Singularity refers to infinite (1/0). This situation will occur at the crack tip. If it has finite value, termed as non-singular.
A matrix is said to be singular if and only if its determinant is zero, and non-singular matrix is matrix with non-zero determinant
Singular matrix: is square matrix whose determinats is equal to Zero.
Non-Singular :is also square matrix whose determints is not equal to Zero.
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