A 
matrix that has no inverse is called singular.
Definitions:
Coupon Rate
The yearly interest yield on a bond, shown as a percentage of its nominal value, disbursed from the date of issuance to the date it matures.
Present Value
A calculation that determines the current value of an amount of money to be received in the future, discounted at a specific interest rate.
Yield To Maturity
Yield to maturity is the total return expected on a bond if the bond is held until it matures, including all interest payments and the repayment of par value.
Annual Coupon
A fixed interest rate paid by a bond issuer to the bondholder, typically paid annually.
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