I want to get an overview of the matrix arithmetic operations available within STAN. The documentation (5.2 Matrix arithmetic operators | Stan Functions Reference) contains the signature of the operations, however, I feel it’s incomplete without providing the return value. They are like the following

```
vector operator*(matrix x, vector y)
The product of the matrix x and vector y
```

Without mentioning if it’s a dot product or something else.

The error messages on the other hand are more perfect, showcasing signatures such as,

```
operation *(row_vector, vector) -> real
```

I am wondering where can I get such documentation without stepping into error messages.

Thanks