We prove Singer's formulas and unstable acyclic relations for the mod $2$ Steenrod algebra, which are important tools for the computations of products. These are given by analogy of the corresponding dual results for the lambda algebra.
"Singer's formulas for the Steenrod algebra." Hiroshima Math. J. 39 (1) 123 - 132, March 2009. https://doi.org/10.32917/hmj/1237392381