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Rueven's Seforim
The Age of the Universe - A Torah-True Perspective By Rabbi Aryeh Kaplan
eBook (PDF): $0.00
This is a transcript of a lecture given by Rabbi Aryeh Kaplan z'tl which discusses the question of the age of the Universe according to Torah thought: Is it around 6000 years old or billions?... More > Rabbi Kaplan goes through various approaches to this question, and concludes with a view based on authoritative sources from over 700 years ago, which lead to a very satisfactory answer. Also briefly touching on other interesting topics, this booklet is an important read for anyone wanting a non-apologetic answer to this question. Price for printed version is profit-free. Only lulu makes money as a printing fee.< Less
The Age of the Universe - A Torah-True Perspective By Rabbi Aryeh Kaplan
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This is a transcript of a lecture given by Rabbi Aryeh Kaplan z'tl which discusses the question of the age of the Universe according to Torah thought: Is it around 6000 years old or billions?... More > Rabbi Kaplan goes through various approaches to this question, and concludes with a view based on authoritative sources from over 700 years ago, which lead to a very satisfactory answer. Also briefly touching on other interesting topics, this booklet is an important read for anyone wanting a non-apologetic answer to this question. Price for printed version is profit-free. Only lulu makes money as a printing fee.< Less
Universal Jewish History Volume 1: Ancient Jewish History By Rabbi Philip Biberfeld
eBook (PDF): $0.00
A great book on ancient Jewish history. A must read!
Azimuthal Modulational Instability of Vortex Solutions to the Two Dimensional Nonlinear Schrödinger Equation By Ronald Meyer Caplan
Paperback: $25.00
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We study the azimuthal modulational instability (MI) of vortices with different topological charges, in the focusing two-dimensional nonlinear Schrödinger (NLS) equation. The method of studying... More > the stability relies on freezing the radial direction in the Lagrangian functional of the NLS in order to form a quasi-one-dimensional azimuthal equation of motion, and then applying a stability analysis in Fourier space of the azimuthal modes. We formulate predictions of growth rates of individual modes and find that vortices are unstable below a critical azimuthal wave number. Steady state vortex solutions are found by first using a variational approach to obtain an asymptotic analytical ansatz, and then using it as an initial condition to a nonlinear equation numerical optimization routine. The stability analysis predictions are corroborated by direct numerical simulations of the NLS performed on a polar coordinate finite-difference scheme.< Less
Azimuthal Modulational Instability of Vortex Solutions to the Two Dimensional Nonlinear Schrödinger Equation By Ronald Meyer Caplan
eBook (PDF): $2.50
We study the azimuthal modulational instability (MI) of vortices with different topological charges, in the focusing two-dimensional nonlinear Schrödinger (NLS) equation. The method of studying... More > the stability relies on freezing the radial direction in the Lagrangian functional of the NLS in order to form a quasi-one-dimensional azimuthal equation of motion, and then applying a stability analysis in Fourier space of the azimuthal modes. We formulate predictions of growth rates of individual modes and find that vortices are unstable below a critical azimuthal wave number. Steady state vortex solutions are found by first using a variational approach to obtain an asymptotic analytical ansatz, and then using it as an initial condition to a nonlinear equation numerical optimization routine. The stability analysis predictions are corroborated by direct numerical simulations of the NLS performed on a polar coordinate finite-difference scheme.< Less
Ohr Shalom (Paperback) By Rabbi Naftali Reich
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This is a paper-back edition of Ohr Shalom. It is identical in formatting to the hardcover. Price is profit-free. Only lulu makes money as a printing fee.
Bigdeh Shesh (Paperback) By Rabbi Yosef Gavriel Bechhofer
eBook (PDF): $0.00
(1 Ratings)
This is a small-font paperback edition of Bigdeh Shesh. This economy edition is the same as the hardcover except less pages due to small font size. Price is profit-free. Only lulu makes money as a... More > printing fee.< Less
Universal Jewish History Volume 1: Ancient Jewish History By Rabbi Philip Biberfeld
eBook (PDF): $0.00
A great book on ancient Jewish history. A must read!
Exotic Shofars By Rabbi Natan Slifkin
eBook (PDF): $0.00
(1 Ratings)
A survey of halachic issues with exotic shofars.
The Mud of a Jew and Other Hasidic Stories (Paperback) By Yaacov Dovid Shulman
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Paperback version. Identical in content to hardback, see discription there! Price is profit-free. Only lulu makes money as a printing fee.