Mermaid

Show version

```mermaid
info
``` 

info

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merge arrows

```mermaid
flowchart LR
    A---B_( ):::empty
    B_-->|3|B
    C---B_

    classDef empty width:0px,height:0px;
```

flowchart LR
    A---B_( ):::empty
    B_-->|3|B
    C---B_

    classDef empty width:0px,height:0px;

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Math

mermaid support Katex but as long as below does not render, GitHub does not.

```mermaid
flowchart LR
    A["$$f_i$$"]
```

flowchart LR
    A["$$f_i$$"]

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