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This wiki is a resource for people who do research in time scale calculus. Time scale calculus is a unification and extension of differential and difference calculus in which one does calculus upon a set called a time scale $\mathbb{T}$. When $\mathbb{T}=\mathbb{R}$ the resulting theory is differential calculus but when $\mathbb{T}=\mathbb{Z}$ the resulting theory is difference calculus. Time scales also include any closed subset of $\mathbb{R}$, so more exotic sets such as the Cantor set are also considered in the theory.

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Calculus on time scales

• Abel's theorem
• List of time scales
• $\Delta$-derivative
• $\nabla$-derivative
• $\Diamond$-derivative
• $\Delta$-integral
• $\nabla$-integral
• $\Diamond$-integral
• Dynamic Equations
• Complex calculus on time scales
• Convergence of time scales
• Function spaces
• Laplace transform
• Mean value theorem
• Fourier transform
• Regressive function
• Variation of parameters
• Wronskian

Probability Theory

• Moments
• Probability density function
• Moment generating function
• Expected value
• Variance

Examples of time scales

1. The real line: $\mathbb{R}$
2. The integers: $\mathbb{Z} = \{\ldots, -1,0,1,\ldots\}$
3. Multiples of integers: $h\mathbb{Z} = \{ht \colon t \in \mathbb{Z}\}$
4. Quantum numbers ($q>1$): $\overline{q^{\mathbb{Z}}}$
5. Quantum numbers ($q<1$): $\overline{q^{\mathbb{Z}}}$
6. Square integers: $\mathbb{Z}^2 = \{t^2 \colon t \in \mathbb{Z} \}$
7. Harmonic numbers: $\mathbb{H}=\left\{\displaystyle\sum_{k=1}^n \dfrac{1}{k} \colon n \in \mathbb{Z}^+ \right\}$
8. The closure of the unit fractions: $\overline{\left\{\dfrac{1}{n} \colon n \in \mathbb{Z}^+\right\}}$
9. Isolated points: $\mathbb{T}=\{\ldots, t_{-1}, t_{0}, t_1, \ldots\}$

Inequalities

• Bernoulli inequality
• Bihari inequality
• Cauchy-Schwarz inequality
• Gronwall inequality
• Hölder inequality
• Jensen inequality
• Lyapunov inequality
• Minkowski inequality
• Opial inequality
• Wirtinger inequality

Special functions on time scales

• Polynomials
• $\Delta$-$\cos_p$
• $\Delta$-$e_p$
• $\Delta$-$\sin_p$
• Gamma function
• Hyperbolic functions
• Logarithms
• $\nabla$-$\cos_p$
• $\nabla$-$\hat{e}_p$
• $\nabla$-$\sin_p$
• Trigonometric functions
• Gaussian bell

Probability Distributions on time scales

• Uniform distribution
• Exponential distribution
• Gamma distribution