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Originally Posted by 6string
Slash chords also known as Polychords
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That's not quite right, 6string, polychords are two chords played together, which is what extended chords are. Some slash chords are, some aren't. For example, a C11 is really a C chord AND a Bb chord played together ... so you can write that as Bb/C ... but a G/B is just a major triad.
Slash chords are chords with bass notes
other than the usual 1. They're usually either the 3 or 5, but can be other notes, which of course become chord tones once they're there being played. As Simon points out, a G/F is really a G7, but a specific inversion of G7 where the b7 (the F) is played as bass note.
Using G as example, you can have:
G/B, G/C (sus4), G/D, G/F (7th), G/F# (Maj7) ... G/E is better known as Em7 ... G/A is better known as A11 ...
That's my understanding, anyway!