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  2. Time constant - Wikipedia

    en.wikipedia.org/wiki/Time_constant

    In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. [1] [note 1] The time constant is the main characteristic unit of a first-order LTI system. In the time domain, the usual choice to ...

  3. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    In finance, a coupon is the interest payment received by a bondholder from the date of issuance until the date of maturity of a bond . Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. For example, if a bond has a face value of ...

  4. Suicide methods - Wikipedia

    en.wikipedia.org/wiki/Suicide_methods

    Overall suicide deaths were cut by 70%, with 93,000 lives saved over 20 years as a result of banning these pesticides. In Korea, banning a single pesticide, paraquat , halved the number of suicides by pesticide poisoning [2] and reduced the total number of suicides in that country.