1 Correction to: Adv. Appl. Clifford Algebras (2021) 31:69 https://doi.org/10.1007/s00006-021-01169-w

Unfortunately, the symbol , for partial orthogonality, has been incorrectly replaced by \(\perp \). The instances in which one should read instead of \(\perp \) are:

page 5, Definition 2.2, “...(we write )...”

page 5, Proposition 2.3 (i), “ ...”

page 5, Proposition 2.3 (ii), “ ...”

page 5, Proposition 2.3 (iii), “...then .”

page 5, second line before Definition 2.4, “Note that is not...”

page 5, Definition 2.4 (i), “If we say ...and write ”. Note that the \(\perp \) in Definition 2.4 (ii) is correct.

page 6, second line of Proposition 2.7, “.”

page 7, second line, “.”

page 8, second line before Proposition 2.13, “implies .”

page 16, fourth line before Proposition 3.26, “and , (2) gives ...”

page 16, second line before Proposition 3.26, “, both ...”

page 16, third line after Definition 3.27, “...and if we can ...”

page 24, second line of Corollary 5.3, “

page 29, Corollary A.8, “.”

Also, reference [29] is missing some information. It should be:

[29] Mandolesi, A.L.G.: Projection factors and generalized real and complex Pythagorean theorems. Adv. Appl. Clifford Al. 30, 43 (2020). https://doi.org/10.1007/s00006-020-01070-y