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Bitcoin Cryptocurrency Mastering Development

What is the math behind a private key BASE58 (P2PKH)

Using this link I can understand something about a private key BASE58 (P2PKH): "such encodings will always yield a 51-character string that starts with ‘5’, or more specifically, either ‘5H’, ‘5J’, or ‘5K’." So let’s say I have this model of private key: 5J1111111111111111111111111111111111110111111222222 I know that is not a valid private key because I […]

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Ask Biology

Why is prothrombin time used to monitor warfarin and not activated partial thromboplastin time?

Warfarin is said to change prothrombin time (PT) but not activated partial thromboplastin time (aPTT) (for practical purposes at least anyways, not really sure). But looking at the mechanism of action of warfarin, I dont see why that is. Warfarin works by inhibiting vitamin K, or more specifically, vitamin K-mediated post-transnational modifications of certain clotting […]

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Ask Health Medical

Why is PT used to monitor warfarin and not aPTT?

Warfarin is said to change PT but not aPTT (for practical purposes at least anyways, not really sure). But looking at the mechanism of action of warfarin, I dont see why that is. Warfarin works by inhibiting vitamin K, or more specifically, vitamin K-mediated post-transnational modifications of certain clotting factors (X, IX, VII and II) […]

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Linux Mastering Development Ubuntu

Sudo – Understanding of what it does

This is just me wanting to understand ‘sudo’ better. I am logged in to my Ubuntu 18.04LTS machine as ‘alan’ which is a normal user, and is a member of the ‘sudo’ group: $ groups alan adm cdrom sudo dip plugdev lpadmin sambashare First I did this (I have correctly entered my password): sudo touch […]

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Ask Mathematics

Determine if two annuli intersect by just looking at the generating triangles

Draw a random triangle on the plane and label its vertices $A$, $B$ and $C$: Now draw a circle with $A$ as its center and $\overline{AB}$ as its radius, and one with $\overline{AC}$ as its radius: These two circles ($OA_B$ and $OA_C$) form an annulus. Do the same with $B$ as the center: We have […]