Gavran's latest activity
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GGavran reacted to nomadreid's post in the thread Undergrad 2 interpretations of bra-ket expression: equal, & isomorphic, but... with
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Thanks for the replies, Gavran and Wrobel. First, Gavran. That is good to hear. Could you give me an example of each, and why? (That... -
GGavran replied to the thread Undergrad 2 interpretations of bra-ket expression: equal, & isomorphic, but....There is a difference. The difference lies not only in the fact that an inner product is bilinear and a dual space operation is linear...
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GGavran replied to the thread How do I derive an expression for the velocity vector for any α?.This is a periodic back-and-forth motion, and ## s ## is the distance of the moving bar from its initial position. Why do you expect ##...
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GGavran replied to the thread High School The parallel axiom, Stillwell's "Reverse Mathematics".The author says, “It follows that if α+β equals two right angles (that is, a straight angle) then l and m do not meet.” and he keeps on...
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GGavran replied to the thread High School The parallel axiom, Stillwell's "Reverse Mathematics".The author is right. It is all about “if and only if”. The parallel axiom includes “⇒” and it does not include “⇐”. “⇐” is included by...
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GGavran replied to the thread Mathematical definition of a rigid body.See the images below. Both functions are automorphisms.
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GGavran replied to the thread Mathematical definition of a rigid body.There is an interesting definition that can help. A rigid set is a set with the identity function as its only automorphism.
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GGavran replied to the thread Undergrad Why is water pressure increased in a plastic bag in a bucket?.https://ceramicartsnetwork.org/ceramics-monthly/ceramics-monthly-article/quick-tip-reconstituting-clay
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GGavran replied to the thread Number trick.Great. The formula can also be written in the form of ## (10_d-1_d)\cdot11_d\cdot11_d ##.
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GInteresting. In general case of base-d system, the result value is ## d^3+d^2-d-1=(d-1)(d+1)^2## For 2-digit it is ##(d-1)(d+1)##
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GGavran replied to the thread Number trick.I get ## 1089 ##. There is a number ## a=100x+10y+z ## and there is a number ## b=100z+10y+x ## where ## a\gt b ##. ##...
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GGavran reacted to TensorCalculus's post in the thread Praise 2025 PF Member Awards Ceremony with Like.
Awh thank you that means so much :cry:❤️🩹
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GGavran reacted to Greg Bernhardt's post in the thread Praise 2025 PF Member Awards Ceremony with Like.
It's been another incredible year spent on PF! Thanks to all contributing members for making it special! This year we're coming upon 25...
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GGavran replied to the thread Praise 2025 PF Member Awards Ceremony.It was an honor. Congratulations, @PeroK, @Ibix, @Orodruin, @kuruman, @DaveE, @fresh_42, @Charles Link, @Baluncore, @Chestermiller...
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GDear Robert, My condolences to you and your family. He was a great contributor to the PF community. We will miss him. I will miss his...
