how can i add delta (as x _1- x_2) in OO?

To: debian-user@lists.debian.org
Subject: how can i add delta (as x _1- x_2) in OO?
From: Jabka Atu <borissh1983@gmail.com>
Date: Mon, 30 Oct 2006 09:09:28 +0200
Message-id: <[🔎] 4545A528.6090105@gmail.com>

hello ...

how can i add delta sign in formulas when i use math ?
for exmample :
Delta X = X_1 - X_2

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