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Rueven's Seforim
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
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
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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
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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
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(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
Exotic Shofars By Rabbi Natan Slifkin
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(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.
Living Up to the Truth By Rabbi Dr. Dovid Gottlieb
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(1 Ratings)
A rational justification for living traditional Judaism. Rejecting a "leap of faith", the author shows that there is sufficient evidence to warrant basing one's life on the truth of the... More > Torah. Includes additional essay of the story of how Rabbi Gottlieb became religious. This publication is available for free here, as well as on Rabbi Gottlieb's web site. Price for printed version is profit-free. Only lulu makes money as a printing fee.< Less