The presentation of the book leans heavily on mathematics, and good understanding of some parts of the book require skills in ground level university mathematics. You manage rather well also with high school mathematics and positive attitude (or maybe also with pure positive attitude). Both classical gravitation theory and general relativity theory are treated using easier mathematics than in standard presentations. The basic structure of the theories is presented clearly in the book. Some new results with relation to planet orbits are presented in the book.
U. Kivi has university examination -civil engineer- with major subject in physics and minor subject in mathematics. He has made thermodynamic calculations with relation to nuclear power station accidents. Due to his background the style of the writer is very pragmatic and the description of thermodynamic processes is very thorough in books 'Termodynamiikka' and 'Thermodynamics'. The writer is interested in relativity theory - books 'Painovoima' and 'Gravitation', but is not at all professional in that field. Because Finnish name 'Uuno' means one in Italy or ein in Germany and name 'Kivi' means stein in Germany, pseudonym 'Uuno Kivi' may be interpreted as Einstein. Uuno means also stupid in Finnish, so that if the reader doesn't like the contents of the books he/she may interpret the pseudonym as 'stupid as a stone'.
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