This notation is not so common in basic mathematics, but it is so incredibly convenient, especially with Einstein notation as shown at Section "Einstein notation for partial derivatives":
This notation is similar to partial label partial derivative notation, but it uses indices instead of labels such as , , etc.
They do two things:
- make a closed source science journal with insanely high impact factor as of 2019
- gamify science by letting (mostly mostly British) dudes like Newton and Paul Dirac add some random letters after their real names to show off
They sent one of the rare spams Ciro actually was interested in!!! Likely going down lists of top Stack Overflow users.
They have some kind of cryptocurrency, TCHME token, as a reward. Ciro wonders if the value of TCHME will ever be high enough to serve as a valid incentive.
Also, what is the total TCHME supply? Can the website devs issue as much as they want? They do giveaways e.g. as shown at: twitter.com/TeachMeAsap/status/1621353671840899072
And a centralized system with a certralized marketplace would work just as well for the initial phases. But fair play, the idea is interesting.
Running:gives:
hd hello_world.out00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 02 00 3e 00 01 00 00 00 b0 00 40 00 00 00 00 00 |..>.......@.....|
00000020 40 00 00 00 00 00 00 00 10 01 00 00 00 00 00 00 |@...............|
00000030 00 00 00 00 40 00 38 00 02 00 40 00 06 00 03 00 |....@.8...@.....|
00000040 01 00 00 00 05 00 00 00 00 00 00 00 00 00 00 00 |................|
00000050 00 00 40 00 00 00 00 00 00 00 40 00 00 00 00 00 |..@.......@.....|
00000060 d7 00 00 00 00 00 00 00 d7 00 00 00 00 00 00 00 |................|
00000070 00 00 20 00 00 00 00 00 01 00 00 00 06 00 00 00 |.. .............|
00000080 d8 00 00 00 00 00 00 00 d8 00 60 00 00 00 00 00 |..........`.....|
00000090 d8 00 60 00 00 00 00 00 0d 00 00 00 00 00 00 00 |..`.............|
000000a0 0d 00 00 00 00 00 00 00 00 00 20 00 00 00 00 00 |.......... .....|
000000b0 b8 01 00 00 00 bf 01 00 00 00 48 be d8 00 60 00 |..........H...`.|
000000c0 00 00 00 00 ba 0d 00 00 00 0f 05 b8 3c 00 00 00 |............<...|
000000d0 bf 00 00 00 00 0f 05 00 48 65 6c 6c 6f 20 77 6f |........Hello wo|
000000e0 72 6c 64 21 0a 00 2e 73 79 6d 74 61 62 00 2e 73 |rld!...symtab..s|
000000f0 74 72 74 61 62 00 2e 73 68 73 74 72 74 61 62 00 |trtab..shstrtab.|
00000100 2e 74 65 78 74 00 2e 64 61 74 61 00 00 00 00 00 |.text..data.....|
00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000150 1b 00 00 00 01 00 00 00 06 00 00 00 00 00 00 00 |................|
00000160 b0 00 40 00 00 00 00 00 b0 00 00 00 00 00 00 00 |..@.............|
00000170 27 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |'...............|
00000180 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000190 21 00 00 00 01 00 00 00 03 00 00 00 00 00 00 00 |!...............|
000001a0 d8 00 60 00 00 00 00 00 d8 00 00 00 00 00 00 00 |..`.............|
000001b0 0d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001c0 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001d0 11 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 |................|
000001e0 00 00 00 00 00 00 00 00 e5 00 00 00 00 00 00 00 |................|
000001f0 27 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |'...............|
00000200 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000210 01 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 |................|
00000220 00 00 00 00 00 00 00 00 90 02 00 00 00 00 00 00 |................|
00000230 08 01 00 00 00 00 00 00 05 00 00 00 07 00 00 00 |................|
00000240 08 00 00 00 00 00 00 00 18 00 00 00 00 00 00 00 |................|
00000250 09 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 |................|
00000260 00 00 00 00 00 00 00 00 98 03 00 00 00 00 00 00 |................|
00000270 4c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |L...............|
00000280 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000290 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000002a0 00 00 00 00 00 00 00 00 00 00 00 00 03 00 01 00 |................|
000002b0 b0 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 |..@.............|
000002c0 00 00 00 00 03 00 02 00 d8 00 60 00 00 00 00 00 |..........`.....|
000002d0 00 00 00 00 00 00 00 00 01 00 00 00 04 00 f1 ff |................|
000002e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000002f0 11 00 00 00 00 00 02 00 d8 00 60 00 00 00 00 00 |..........`.....|
00000300 00 00 00 00 00 00 00 00 1d 00 00 00 00 00 f1 ff |................|
00000310 0d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000320 00 00 00 00 04 00 f1 ff 00 00 00 00 00 00 00 00 |................|
00000330 00 00 00 00 00 00 00 00 2d 00 00 00 10 00 01 00 |........-.......|
00000340 b0 00 40 00 00 00 00 00 00 00 00 00 00 00 00 00 |..@.............|
00000350 34 00 00 00 10 00 02 00 e5 00 60 00 00 00 00 00 |4.........`.....|
00000360 00 00 00 00 00 00 00 00 40 00 00 00 10 00 02 00 |........@.......|
00000370 e5 00 60 00 00 00 00 00 00 00 00 00 00 00 00 00 |..`.............|
00000380 47 00 00 00 10 00 02 00 e8 00 60 00 00 00 00 00 |G.........`.....|
00000390 00 00 00 00 00 00 00 00 00 68 65 6c 6c 6f 5f 77 |.........hello_w|
000003a0 6f 72 6c 64 2e 61 73 6d 00 68 65 6c 6c 6f 5f 77 |orld.asm.hello_w|
000003b0 6f 72 6c 64 00 68 65 6c 6c 6f 5f 77 6f 72 6c 64 |orld.hello_world|
000003c0 5f 6c 65 6e 00 5f 73 74 61 72 74 00 5f 5f 62 73 |_len._start.__bs|
000003d0 73 5f 73 74 61 72 74 00 5f 65 64 61 74 61 00 5f |s_start._edata._|
000003e0 65 6e 64 00 |end.|
000003e4Crazy overlaps with Ciro Santilli's OurBigBook Project, Wikipedia states:
Administrators of Project Xanadu have declared it superior to the World Wide Web, with the mission statement: "Today's popular software simulates paper. The World Wide Web (another imitation of paper) trivialises our original hypertext model with one-way ever-breaking links and no management of version or contents.
www.nytimes.com/2021/01/12/technology/bitcoin-passwords-wallets-fortunes.html
As for his lost password and inaccessible Bitcoin, Mr. Thomas has put the IronKey in a secure facility - he won’t say where - in case cryptographers come up with new ways of cracking complex passwords. Keeping it far away helps him try not to think about it, he said.
“I would just lay in bed and think about it," Mr. Thomas said.
- battery life:
- 2023-04: on-browser streaming + light browsing on Ubuntu 22.10: about 2h45. Too low! Gotta try buying a new battery.
- 2022-01-04 updated firmward after noticing that ubuntu 21.10 does not wake up from suspend seemed to happen every time when not connected to external power.
dmidecodediff excerpt:used the "Ubuntu Software" GUI as mentioned at: support.lenovo.com/gb/en/solutions/ht510810-how-to-do-software-updates-linux. Kudos for making this accessible to newbs.BIOS Information Vendor: LENOVO - Version: N1UET40W (1.14 ) - Release Date: 09/28/2017 + Version: N1UET71W (1.45 ) + Release Date: 07/18/2018After doing that, another update became available to: 0.1.56, clicked it and was much faster than the previous one, and didn't auto reboot. After manual reboot,dmidecodediffed again:plus a bunch of other lines.BIOS Information Vendor: LENOVO - Version: N1UET71W (1.45 ) - Release Date: 07/18/2018 + Version: N1UET82W (1.56 ) + Release Date: 08/12/2021 - 2021-06-05 upgraded to Ubuntu 21.04 with a clean install from an ISO. SelectedAfter this, the GUI felt fast, who would have thought that erasing a bunch of stuff would make the system faster!
- "Minimal installation"
- "Erase disk and install Ubuntu". Notably, this erased the Microsoft Windows that came with the computer and was never used not even once
- "Erase disk ans use ZFS"
- Encrypt the new Ubuntu installation for security
lsblkcontains:andzd0 230:0 0 500M 0 disk └─keystore-rpool 253:0 0 484M 0 crypt /run/keystore/rpool nvme0n1 259:0 0 476.9G 0 disk ├─nvme0n1p1 259:1 0 512M 0 part /boot/efi ├─nvme0n1p2 259:2 0 2G 0 part │ └─cryptoswap 253:1 0 2G 0 crypt ├─nvme0n1p3 259:3 0 2G 0 part └─nvme0n1p4 259:4 0 472.4G 0 partlsblk -f:zd0 crypto_LUKS 2 └─keystore-rpool ext4 1.0 keystore-rpool nvme0n1 ├─nvme0n1p1 vfat FAT32 ├─nvme0n1p2 crypto_LUKS 2 │ └─cryptoswap ├─nvme0n1p3 zfs_member 5000 bpool └─nvme0n1p4 zfs_member 5000 rpooThen:contains:grep '[rb]pool' /proc/mountswhich gives an idea of how the above map to mountpoints.rpool/ROOT/ubuntu_uvs1fq / zfs rw,relatime,xattr,posixacl 0 0 rpool/USERDATA/ciro_czngbg /home/ciro zfs rw,relatime,xattr,posixacl 0 0 rpool/USERDATA/root_czngbg /root zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/srv /srv zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/usr/local /usr/local zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/games /var/games zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/log /var/log zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/lib /var/lib zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/mail /var/mail zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/snap /var/snap zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/www /var/www zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/spool /var/spool zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/lib/AccountsService /var/lib/AccountsService zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/lib/NetworkManager /var/lib/NetworkManager zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/lib/apt /var/lib/apt zfs rw,relatime,xattr,posixacl 0 0 rpool/ROOT/ubuntu_uvs1fq/var/lib/dpkg /var/lib/dpkg zfs rw,relatime,xattr,posixacl 0 0 bpool/BOOT/ubuntu_uvs1fq /boot zfs rw,nodev,relatime,xattr,posixacl 0 0
2020-06-06: dropped some lemon juice on the bottom left of touchpad. Bottom left button not working anymore... I'm an idiot. There are many other alternatives, but very aggravating, I'll replace it for sure. Can't find the exact replacement part or any videos showing its replacement online easliy, dang. For the T430: www.youtube.com/watch?v=F3lzV9uXRjU Asked at: forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile-Workstations/P51-left-bottom-button-below-trackpad-mouse-left-click-stopped-working-possible-to-replace/m-p/5019903 Also I could not access it because you need to remove the HDD first: www.youtube.com/watch?v=5Klawxc7T_Y and I can't pull it out even with considerable force, unlike in the video... And OMG, those button caps are impossible to re-install once removed!!! Then when I put the whole thing back together, the upper buttons were not working anymore. FUUUUUUUUCK. When first opening I pulled on it without properly removing the cap and it came off, but it didn't look broken in any way and I put it back in. Keyboard works thank God, so right black connector is fine, left white one oppears to be the one for upper keys and trackpoint, both of which stopped working. The hardware manual confirms that they are both part of the same device, so basically a mouse :-) TODO can it be bought separately from te keyboard? Doesn't look like it, photo of keyboard part includes those buttons. The manual also confirms that the bottom buttons are one device with the trackpad "trackpad with buttons", thus forming the second entire mouse.
2019-04-17: popup asking about "ThinkPad P51 Management Engine Update" from from 182.29.3287 to 184.60.3561, said yes.
- partition setup: askubuntu.com/questions/343268/how-to-use-manual-partitioning-during-installation/976430#976430
- BIOS:
- for NVIDIA driver:
- for KVM, required by Android Emulator: enable virtualization extensions
- TODO fix the brightness keys:
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