i think this is supposed to be a wedge product but someone's typographic compulsion has rendered it really ambiguouspic.twitter.com/iUaUl4WbGQ
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The t superscript makes me think it's more a diagonalization. Capital Lambda often used for that.
i looked over the paper again and yes it was a diagonalization first time i've seen lambda used for it
Lambda being used because often eigenvalues of the matrix pencil are denoted by little lambda.
Also because profs love being jerks and writing V Lambda V^T just to be maximally unintelligible.
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