Release of Einstein NFTs
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- Category: Resources
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Two years ago, I have started to study the blockchain technology, and i want to believe that its decentralized and trustless parts would have been of a certain interest to Einstein ;-).
Today, i am happy to offer a NFT (Non Fongible Token) minted on the Polygon Mainet blockchain (10$ sell price) for whoever subscribes to a yearly plan to einsteinrelativelyeasy.
If you are not familiar with the blockchain and NFTs, here is a very short article which explains how to set up everything (5mn max) to be ready to receive your Einstein NFT.
You can have a preview of the 2 unique NFTs present in the collection on the well known OpenSea NFT marketplace via this link: https://opensea.io/0x0Db96222cD1c81fb6863100F474Ef6690a52A0C9
To summarize, if you want to receive one of those NFTs:
- register to a yearly plan
- setup the Metamask wallet and the Polygon Mainet network as explained in the above article
- send me an email to
This email address is being protected from spambots. You need JavaScript enabled to view it. with your public polygon wallet address and i will send you the NFT directly to your wallet. ;-)
Welcome to Einstein Relatively Easy!
Einstein's Relativity is too beautiful and too engaging to be restricted to the professionals!
Have fun!
"I have no special talents
I am only passionately curious"
Albert Einstein
Geodesics from covariant derivative
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- Category: General Relativity
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A geodesic of spacetime is a curve that is straight and uniformly parametrized, as measured in each local Lorentz frame along its way.
If the geosidesic is timelike, then it is a possible wordline for a freely falling particle, and its uniformly ticking parameter λ (called affine parameter) is a multiple of the particule's proper time, λ = κτ + μ.
This definition of geodesic translates into the abstract and coordinate-free language: a geodesic is a curve P(λ) that parallel-transports its tangent vector u = dP/dλ along itself.
Now defining a coordinate system {xα(P)), along with basis vectors eα = ∂/ ∂xα, we can define the tangent vector u and its components
and thus finally the component version of the abstract geodesic equation definition becomes
CQFD
This geodesic equation can be solved (in principle) when both initial data xα and dxα / dλ have been specified.
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