Equality
Equal
noun, な adjective, の adjective
たいとう
等しい (ひとしい) Equal, The Same, Equivalent, Similar
等号 (とうごう) Equal Sign, Equals Sign
対等 (たいとう) Equality, Equal
均等 (きんとう) Equality, Uniformity, Evenness
不等 (ふとう) Inequality, Unequal
Equality was the title たいとう (actually タイトル) of the book.