Optional: Remove GNOME
Note: It’s probably better to run Minimal installation and then install MATE, but if you already installed GNOME, this is the way to get rid of it.

Following command will remove all gnome packages excluding MATE dependencies.
WARNING: Your X session will be terminated during the removal of some GNOME packages, so it’s better to run the following command from another terminal (e.g. Ctrl+Alt+F2).

If you want to confirm removal of each package, exclude the ‘-y’ in the yum command below.

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for i in `yum list installed|grep gnome|grep -v -E 'libgnome|gnome-icon-theme|gnome-keyring|gnome-themes-standard'|awk '{print $1}'`; do yum -y remove $i; done

Install EPEL

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rpm -Uvh http://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

Install MATE

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yum groups install "MATE Desktop"

Replace GDM with LightDM

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systemctl disable gdm.service
systemctl enable lightdm.service

Reboot and select MATE in the LightDM settings (icon is in the upper right corner of login screen).

Enjoy!

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