"Le Sacre," he wrote, "is 'absolute' ballet, and we are assured that it will come to be regarded as having a significance for the 20th century equal to that of Beethoven's choral symphony in the 19th.
In his work the ormolu (a brass imitation of gold) mounts, so important a part of the design of French furniture in the 18th century, became equal to if not more important than, the marquetry decoration of the carcass.
Due to the enormous amount of production, the economic historian Robert Hartwell noted that Chinese iron and coal production in the following 12th century was equal to if not greater than England's iron and coal production in the early phase of the Industrial Revolution during the late 18th century.
Though the built environment continues to expand exponentially, with what has been created in concrete and steel in this century alone almost equal to the sum of construction of all previous centuries, Kostof races through it as if he were waiting for the bell to end the class.
Given a national average of two children per couple, China's population, already well over one billion, would increase by 400 million more people before it leveled off in the 21st century - an increase roughly equal to the size of the total population of North America.
The modestly titled "Lewis and Clark Centennial and American Pacific Exposition and Oriental Fair" would be a Portland extravaganza that would, its directors confidently predicted, propel the city into the new century with a boldness equal to the expectations of the emerging American economy.
The European search for the source of the Nile in the mid 19th century triggered a hysteria equal to the madness of the Space Race in the 1960s.
But those who think the Common Core Standards turn a 19th Century curriculum into a teaching tool equal to the challenges of the 21st Century haven't thought the matter through.
When Rockefeller retired in the early 20th century, his net worth was equal to about one-thirtieth of America's annual GNP.
Tolkien said he could map every inch of Sarehole from memory: Gwenith Hasler has mapped every change of land ownership and use there since the mid-19th century with a topographical passion equal to his.
