希臘字母$$\alpha A \beta B \gamma \Gamma \delta \Delta \epsilon E \\\\\varepsilon \zeta Z \eta H \theta \Theta \vartheta \\\\\iota I \kappa K \lambda \Lambda \mu M \nu N \\\\\xi \Xi o O \pi \Pi \varpi \rho P \\\\\varrho \sigma \Sigma \varsigma \tau T \upsilon \Upsilon \\\\\phi \Phi \varphi \chi X \psi \Psi \omega \Omega $$
效果:
α A β B γ Γ δ Δ ? Eε ζ Z η H θ Θ ?ι I κ K λ Λ μ M ν Nξ Ξ o O π Π ? ρ P? σ Σ ? τ T υ Υ? Φ φ χ X ψ Ψ ω Ω
分?jǐn)?shù)及開(kāi)方$$\frac{1}{4}$$表示開(kāi)平方:$$\sqrt{x^4}$$表示開(kāi) n 次方: $$\sqrt[4]{(a+b)^4}$$
矩陣The characteristic polynomial $\chi(\lambda)$ of the $3 \times 3$~matrix $$ \left( \begin{array}{ccc} a & b & c \\\\d & e & f \\\\g & h & i \end{array} \right)$$is given by the formula$$\chi(\lambda) = \left| \begin{array}{ccc} \lambda - a & -b & -c \\\\-d & \lambda - e & -f \\\\-g & -h & \lambda - i \end{array} \right|.$$
The characteristic polynomial χ(λ) of the 3×3~matrix
求和(Sum)$$\sum_{i=1}^{2n}.$$$$\sum_{k=1}^n k^2 = \frac{1}{2} n (n+1).$$
效果:
2n∑i=1.
n∑k=1k2=12n(n+1).
積分(Integrals)$$\int_a^b f(x)\,dx.$$
效果:
∫baf(x)dx.
The integral sign is typeset using the control sequence \int, and the
limits of integration (in this case a and b are treated as a subscript and a superscript on the integral sign.
Most integrals occurring in mathematical documents begin with an
integral sign and contain one or more instances of d followed by another (Latin or Greek) letter, as in dx, dy and dt. To obtain the correct appearance one should put extra space before the d, using \,.
In some multiple integrals (i.e., integrals containing more than one
integral sign) one finds that LaTeX puts too much space between the
integral signs. The way to improve the appearance of of the integral is to use the control sequence \! to remove a thin strip of unwanted
space.