Periodically Double or Triple of spare instrumentation". Periodically Double or Triple Periodically Double or Triple is a song by American band Yo La Tengo, from their 2009 album "Popular Songs". The music video was directed by John McSwain, and features stop motion animation with pieces of fruit, interspersed with close-ups of various people eating fruit. "Stereogum" felt that it was "mellow" and "could have been written in the '60s", while "the Guardian" called it "strutting, tongue-in-cheek funk". "Pitchfork" faulted the lyrics as "reek(ing) of a distinct lack of confidence", but lauded the music, in particular the "out-of-nowhere elevator-music break". National Public Radio praised it
Quadruple product Quadruple product In mathematics, the quadruple product is a product of four vectors in three-dimensional Euclidean space. The name "quadruple product" is used for two different products, the scalar-valued scalar quadruple product and the vector-valued vector quadruple product or vector product of four vectors . The scalar quadruple product is defined as the dot product of two cross products: where a, b, c, d are vectors in three-dimensional Euclidean space. It can be evaluated using the identity: or using the determinant: The vector quadruple product is defined as the cross product of two cross products: where a, b, c, d