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2. ΔT - Wikipedia

   en.wikipedia.org/wiki/ΔT

   The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. Time ... Finite difference for the mathematics of the Δ operator; Delta ...

3. Greeks (finance) - Wikipedia

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

   The most commonly quoted are 25 delta put, 50 delta put/50 delta call, and 25 delta call. 50 Delta put and 50 Delta call are not quite identical, due to spot and forward differing by the discount factor, but they are often conflated. Delta is always positive for long calls and negative for long puts (unless they are zero).

4. Y-Δ transform - Wikipedia

   en.wikipedia.org/wiki/Y-Δ_transform

   In electrical engineering, the Y-Δ transform, also written wye-delta and also known by many other names, is a mathematical technique to simplify the analysis of an electrical network. The name derives from the shapes of the circuit diagrams , which look respectively like the letter Y and the Greek capital letter Δ .

5. Dirac comb - Wikipedia

   en.wikipedia.org/wiki/Dirac_comb

   The graph of the Dirac comb function is an infinite series of Dirac delta functions spaced at intervals of T. In mathematics, a Dirac comb (also known as sha function, impulse train or sampling function) is a periodic function with the formula ⁡ := = for some given period . [1]

6. Limit (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Limit_(mathematics)

   In mathematics, a limit is the value that a function (or sequence) approaches as the argument (or index) approaches some value. [1] Limits of functions are essential to calculus and mathematical analysis, and are used to define continuity, derivatives, and integrals.

7. Sunflower (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Sunflower_(mathematics)

   Erdos-Rado Delta System Theorem(corollary of the Sunflower lemma): For each k > 0 {\displaystyle k>0} , r > 0 {\displaystyle r>0} , there is an integer f ( k , r ) {\displaystyle f(k,r)} such that if a set system F {\displaystyle F} of k {\displaystyle k} -sets is of cardinality greater than f ( k , r ) {\displaystyle f(k,r)} , then F ...