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Introduction

You can use AsciiMath or JLaTeXMath notation within PlantUML:

@startuml
:int_0^1f(x)dx;
:x^2+y_1+z_12^34;
note right
Try also
d/dxf(x)=lim_(h->0)(f(x+h)-f(x))/h
P(y|\mathbf{x}) \mbox{ or } f(\mathbf{x})+\epsilon
end note
@enduml

or:

@startuml
Bob -> Alice : Can you solve: ax^2+bx+c=0
Alice --> Bob: x = (-b+-sqrt(b^2-4ac))/(2a)
@enduml

Standalone diagram

You can also use @startmath/@endmath to create standalone AsciiMath formula.

@startmath
f(t)=(a_0)/2 + sum_(n=1)^ooa_ncos((npit)/L)+sum_(n=1)^oo b_n\ sin((npit)/L)
@endmath

Or use @startlatex/@endlatex to create standalone JLaTeXMath formula.

@startlatex
\sum_{i=0}^{n-1} (a_i + b_i^2)
@endlatex

How is this working ?

To draw those formulas, PlantUML uses two OpenSource projects:

ASCIIMathTeXImg.js is small enough to be integrated into PlantUML standard distribution.

Since JLatexMath is bigger, you have to download it separately, then unzip the 4 jar files (batik-all-1.7.jar, jlatexmath-minimal-1.0.3.jar, jlm_cyrillic.jar and jlm_greek.jar) in the same folder as PlantUML.jar.

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