Michal Křížek is a senior researcher at the Institute of Mathematics of the Czech Academy of Sciences and a full professor at Charles University in Prague. For many years he was Editor-in-chief of the journal Applications of Mathematics and the Czech journal Advances of Mathematics, Physics and Astronomy. He is a member of the Czech Learned Society and the International Astronomical Union. His research focuses on mathematical and functional analysis, the numerical solution of partial differential equations, mathematical physics, and astrophysics.Lawrence Somer is a professor emeritus of mathematics at the Catholic University of America in Washington, D.C. He obtained his B. A. degree in mathematics from Cornell University in Ithaca, New York, and his PhD. from the University of Illinois. He is a member of the Editorial board of the journal Fibonacci Quarterly. His research interests include number theory, combinatorics, algebra, geometry, and cosmology.

“The present book, written by two mathematicians, is a very interesting and colourfully written text … .” (Theophanes Grammenos, Mathematical Reviews, July, 2024)

• 1 Mathematical Modeling.- 2 Paradoxes in the Special Theory of Relativity.- 3 Einstein's Equations.- 4 Numerical Analysis of Mercury's Perihelion Shift.- 5 Computational Problems of Einstein's Equations.- 6 Friedmann Equation.- 7 Excessive Extrapolations From the Friedmann Equation.- 8 Arguments Against the Proclaimed Amount of Dark Matter.- 9 Dark Energy and the Local Hubble Expansion.- 10 Anthropic Principle and the Hubble-Lemaitre Constant.- 11 Gravitational Waves.- 12 Possible Distribution of Mass Inside a Black Hole.

Michal Křížek is a senior researcher at the Institute of Mathematics of the Czech Academy of Sciences and a full professor at Charles University in Prague. For many years he was Editor-in-chief of the journal Applications of Mathematics and the Czech journal Advances of Mathematics, Physics and Astronomy. He is a member of the Czech Learned Society and the International Astronomical Union. His research focuses on mathematical and functional analysis, the numerical solution of partial differential equations, mathematical physics, and astrophysics.Lawrence Somer is a professor emeritus of mathematics at the Catholic University of America in Washington, D.C. He obtained his B. A. degree in mathematics from Cornell University in Ithaca, New York, and his PhD. from the University of Illinois. He is a member of the Editorial board of the journal Fibonacci Quarterly. His research interests include number theory, combinatorics, algebra, geometry, and cosmology.

“The present book, written by two mathematicians, is a very interesting and colourfully written text … .” (Theophanes Grammenos, Mathematical Reviews, July, 2024)

• 1 Mathematical Modeling.- 2 Paradoxes in the Special Theory of Relativity.- 3 Einstein's Equations.- 4 Numerical Analysis of Mercury's Perihelion Shift.- 5 Computational Problems of Einstein's Equations.- 6 Friedmann Equation.- 7 Excessive Extrapolations From the Friedmann Equation.- 8 Arguments Against the Proclaimed Amount of Dark Matter.- 9 Dark Energy and the Local Hubble Expansion.- 10 Anthropic Principle and the Hubble-Lemaitre Constant.- 11 Gravitational Waves.- 12 Possible Distribution of Mass Inside a Black Hole.

Michal Křížek is a senior researcher at the Institute of Mathematics of the Czech Academy of Sciences and a full professor at Charles University in Prague. For many years he was Editor-in-chief of the journal Applications of Mathematics and the Czech journal Advances of Mathematics, Physics and Astronomy. He is a member of the Czech Learned Society and the International Astronomical Union. His research focuses on mathematical and functional analysis, the numerical solution of partial differential equations, mathematical physics, and astrophysics.Lawrence Somer is a professor emeritus of mathematics at the Catholic University of America in Washington, D.C. He obtained his B. A. degree in mathematics from Cornell University in Ithaca, New York, and his PhD. from the University of Illinois. He is a member of the Editorial board of the journal Fibonacci Quarterly. His research interests include number theory, combinatorics, algebra, geometry, and cosmology.

“The present book, written by two mathematicians, is a very interesting and colourfully written text … .” (Theophanes Grammenos, Mathematical Reviews, July, 2024)

• 1 Mathematical Modeling.- 2 Paradoxes in the Special Theory of Relativity.- 3 Einstein's Equations.- 4 Numerical Analysis of Mercury's Perihelion Shift.- 5 Computational Problems of Einstein's Equations.- 6 Friedmann Equation.- 7 Excessive Extrapolations From the Friedmann Equation.- 8 Arguments Against the Proclaimed Amount of Dark Matter.- 9 Dark Energy and the Local Hubble Expansion.- 10 Anthropic Principle and the Hubble-Lemaitre Constant.- 11 Gravitational Waves.- 12 Possible Distribution of Mass Inside a Black Hole.