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Prisoners of Geography is a collection of reflections on past and present geopolitics through the lens of Geography. Through various global examples, Tim Marshall challenges the widely held belief that technology is allowing humans to overcome geography and render it redundant and irrelevant to issues and processes of geopolitics and conflict.
Conversely, geopolymer cement recipes employed in the field generally involve alkaline soluble silicates with starting molar ratios ranging from 1.45 to 1.95, particularly 1.60 to 1.85, i.e. user-friendly conditions. It may happen that for research, some laboratory recipes have molar ratios in the 1.20 to 1.45 range.
In mathematics, a quadratic function of a single variable is a function of the form [1] = + +,,where is its variable, and , , and are coefficients.The expression + + , especially when treated as an object in itself rather than as a function, is a quadratic polynomial, a polynomial of degree two.