By Lillian R. Lieber

“Oh, what a pleasant publication! this is often the clearest clarification of relativity available—and the main enjoyable. It’s nice to have it to be had back. even if you’re a scientist, you'll savour this book.”—Walter Isaacson, writer of *Einstein: His lifestyles and Universe*

Using “just adequate arithmetic to aid and never to prevent the lay reader,” Lillian R. Lieber offers an intensive clarification of Albert Einstein’s thought of relativity. Her pleasant kind, together along with her husband’s fascinating illustrations, makes for an engaging and obtainable examine probably the most celebrated principles of all times.

“A transparent and brilliant exposition of the fundamental rules and strategies of the speculation of relativity…can be warmly advised specifically to people who can't spend an excessive amount of time at the subject.”—Albert Einstein

“If you recognize high-school math, should not frightened of equations, and need to determine what Einstein quite acknowledged, learn Lillian Lieber’s booklet. she's going to lead you thru detailed and common relativity, assisting you at each step to appreciate the fundamental equations, together with tensors, with notable readability and conciseness. This uniquely fascinating booklet continues to be as vibrant as ever or even extra necessary, due to the superb new foreward and notes by means of David Derbes and Robert Jantzen.”—Peter Pesic, writer of *Abel’s facts: An Essay at the assets and that means of Mathematical Unsolvability* and *Sky in a Bottle*

“Does the character of time fascinate you? Does gravity look a mysterious topic? Are you curious about studying simply what it really is that Einstein truly did that made him so well-known? Then this excellent publication is simply the article. I learn the unique 1945 variation while i used to be a high-school pupil within the Fifties, and it had a massive influence on me. I are expecting an analogous event for you, or even a younger good friend, with this new, up-to-date edition.”—Paul J. Nahin, writer of *Time Machines*, *Oliver Heaviside*, and *Dr. Euler’s awesome Formula*

**Lillian R. Lieber** used to be a professor and head of the dep. of arithmetic at new york collage. She wrote a chain of lighthearted (and well-respected) math books, lots of them illustrated via her husband, **Hugh grey Lieber**.

**David Derbes** teaches physics on the college of Chicago Laboratory Schools.

**Robert Jantzen** is a professor of arithmetic at Villanova University.

## Quick preview of The Einstein Theory of Relativity: A Trip to the Fourth Dimension PDF

Of either scalars We shall a few now speak about amounts which arise in our event and that are neither scalars nor vectors, yet that are referred to as TENSORS. And, once we have we a and outlined those, illustrated shall locate that SCALAR is a TENSOR a TENSOR whose RANK 0, is and a VECTOR and we a is shall see what whose RANK intended via is is ONE, TENSOR of RANK , or 3, and so forth. "TENSOR" is a extra inclusive time period, therefore *A contrast is made among usually ""speed" and "velocity the previous hence whilst is a we SCALAR, the latter a have an interest how briskly a specific thing is and don't care approximately purely relocating, its path of movement, we needs to then converse of its velocity, but when we're additionally in course, we needs to communicate of its speed.

We needs to emphasize the importance of this notation: within the first position, 137 the reader needs to distinguish among the "pressure" on a floor and the "force" performing on the M The p ressurel1 okay strength according to UNIT zone. the So that overall strength MULTIPLYING the the floor. strain via bought via is region the of the outside. hence the product ' PXX dSx supplies the strength appearing upon the projection dS, as a result motion of f, by myself. word the DOUBLE subscripts in ' PXX The first i Pxy i PXZ one evidently refers back to the truth that those 3 pressures from the part emanate all f.

Needs to be famous, notwithstanding, that this omniscient "we" It who can see precisely what is "really" occurring doesn't and in exist, that every one human observers 24 the universe, are fairly within the state of affairs in which five is, particularly, that of no longer figuring out concerning the movement in query, and as a result being OBLIGED to finish that 's watch is incorrect! And consequently, the message five sends telling him that if units his clock again one minute, then their clocks will agree. In a similar manner, that different observers, consider j4,B,C,ctc.

The results of utilizing THE therapy. VI. In the by means of final bankruptcy basic we reached expressed that evidence (p. 34), the realization in the equations x and we observed beginning with x' = = ct (6) ct' (7) forty four which are graphically represented on p. forty-one, and we discovered that those equations now not are if contradictory, they seem like (as we take into accout at first), that there is a distinction within the surroundings of the clocks the 2 diversified structures. in We now, from (6) and (7), among the measurements of the 2 observers, okay and ok shall derive, relationships f .

Phenomenon with the experimental proof. the contraction speculation we're now designating a through x', = t , or x = ct we have now x'/(c v) *Since vf. however the distance the sunshine has traveled is x , and x = ct, therefore x' =x- vt is sixteen resembling a/(c v) = t. proposed by means of Lorentz, x will be divided through /3, in order that equation (3) turns into r x7/3 or x' Now - vt - vt). (x = x = whilst Lorentz tested as acknowledged on 1 p. (4) different fads, five, he stumbled on that equation (4) was once really in concord with ail those yet that he used to be now obliged proof, to introduce yet another correction expressed via the equation (5) the place /3 , t , v , x , and c have an analogous that means as earlier than yet what's t?!