# Reply to: "TOV or OV? The Whole Story"

## TL;DR

This paper defends the naming of the hydrostatic equilibrium equation as the Oppenheimer-Volkoff (OV) equation, reaffirming its original attribution over the later TOV designation, in response to a comment disputing this.

## Contribution

The paper clarifies and reaffirms the original attribution of the hydrostatic equilibrium equation to Oppenheimer and Volkoff, countering the claim that it should be called the TOV equation.

## Key findings

- Reaffirms the original attribution of the equation to Oppenheimer and Volkoff.
- Counters the argument that the equation should be called the TOV equation.
- Provides a clarification on the historical naming of the equation.

## Abstract

We argued previously that the well-known equation for hydrostatic equilibrium in a static spherically symmetric spacetime supported by an isotropic perfect fluid should be called the Oppenheimer-Volkoff (OV) equation, rather than the Tolman-Oppenheimer-Volkoff (TOV) equation, a later ArXiv manuscript has disagreed. Here we reply to that comment, reaffirming the original argument.