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Originally Posted by HaVIC5
No, those are dominant sevenths or minor sevenths. Diminished sevenths actually are flatted twice to be enharmonic to the major 6th.
Besides the special case of the seventh, one uses the term "minor" to describe a flattened interval unless it's a perfect interval to begin with (unison, fourth, fifth, octave), which is when you use "diminished".
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How is this so? A major seventh is just a B in the key of C and a minor seventh is a Bb in the key of C. Diminished is a Bbb in the key of C...it's the same rule as a third or a second.