From: Andrew Lorimer Date: Thu, 7 Feb 2019 06:20:10 +0000 (+1100) Subject: added old philosophy notes X-Git-Tag: yr12~256^2 X-Git-Url: https://git.lorimer.id.au/notes.git/diff_plain/5b347a9279f91d12edd7fb430e5c6fbd2e740a6a?ds=sidebyside added old philosophy notes --- diff --git a/philosophy/._time travel.md b/philosophy/._time travel.md deleted file mode 100755 index ce813ef..0000000 Binary files a/philosophy/._time travel.md and /dev/null differ diff --git a/philosophy/._time travel.md.html b/philosophy/._time travel.md.html deleted file mode 100755 index 4d8e90b..0000000 Binary files a/philosophy/._time travel.md.html and /dev/null differ diff --git a/philosophy/._time.md b/philosophy/._time.md deleted file mode 100755 index 0a45ab6..0000000 Binary files a/philosophy/._time.md and /dev/null differ diff --git a/philosophy/dholbach.pdf b/philosophy/dholbach.pdf new file mode 100644 index 0000000..d64b010 Binary files /dev/null and b/philosophy/dholbach.pdf differ diff --git a/philosophy/essay-structure.pptx b/philosophy/essay-structure.pptx new file mode 100644 index 0000000..f17e5c2 Binary files /dev/null and b/philosophy/essay-structure.pptx differ diff --git a/philosophy/free-will-determinism.pdf b/philosophy/free-will-determinism.pdf new file mode 100644 index 0000000..2d67345 Binary files /dev/null and b/philosophy/free-will-determinism.pdf differ diff --git a/philosophy/hume-summary.docx b/philosophy/hume-summary.docx new file mode 100644 index 0000000..d4d6a7d Binary files /dev/null and b/philosophy/hume-summary.docx differ diff --git a/philosophy/knowledge.md b/philosophy/knowledge.md deleted file mode 100755 index e69de29..0000000 diff --git a/philosophy/notes.pdf b/philosophy/notes.pdf new file mode 100644 index 0000000..7302cbe Binary files /dev/null and b/philosophy/notes.pdf differ diff --git a/philosophy/time travel.md b/philosophy/time travel.md deleted file mode 100755 index 1fec2ea..0000000 --- a/philosophy/time travel.md +++ /dev/null @@ -1,79 +0,0 @@ -# Time Travel and Quantum Mechanics - -## What is time? -- time is what clocks measure - - measure time objectively, therefore does not help our subjective definition of time - -- $t$ - just like another quantitative variable (period of time, not absolute) - - -- fourth dimension - -- these describe properties of it, not its implications or how it works - - implications are generally determined through intuition - - -- sense of time is inherent to all humans - every human has memory and some idea that time is observable through changes in space - - - computers have memory, do they have a concept of time? - -Therefore, we have: - -**1. Subjective time** -- presumably everyone experiences this notion of time -- has the property of lapsing (time approaches $\infty$) - -**2. Physical time** -- represented by $t$ -- objective -- quantitative (period, not absolute) - -> All paradoxes arise from the fact that time lapses / flows - we are basing time on subjective time, not physical time - -## Concepts of time in physics - -### Thermodynamic time arrow -- second law of thermodynamics: -- total entropy cannot decrease over time (randomness of particles) -- Hence, time has a specific direction (approaching infinite entropy) -- This can be modelled as $t=e$. If $e$ cannot be subtracted from, $t$ can only go one way. -- entropy is an irreversible process -- therefore, time travel backwards is impossible - -### Block time -- time is fourth dimension - all dimensions are related -- universe exists as a whole, in four dimensions, just like a chair can exist in three dimensions (plus time) -- you cannot isolate one value in one of the three dimensions and define it by itself - it would be ridiculous to say that a point ($x=2,y=1,z=3$) can exist if y and z are not defined -- therefore, past and future must also exist as a relation of four values ($x,y,z,t$) - - -2. Are the past and future real? -By using the present as a proxy for the past or future, we can simulate them, effectively nesting times inside times (a simpler idea of a time machine - normal time machines lose the idea of the present). - -3. Do events that occurred in the past / future exist? - -> What is the physical prompt to change to a different time? - -## Grandfather paradox - -- Grandfather is not necessary - could be the suicide paradox -- Mathematical status - 1 bit (dead or alive): - - $x=$ existence at 2 yrs, $y=$ existence at 20 yrs - - $0=$ dead, $1=$ alive -- $x=1$ (alive - assumed because you must exist in the first instance) - - -**(case 1)** if $x=1$, then $y=1$ (assuming you don't die between) $\therefore x = y$ -**(case 2)** if $y=1$, then $x=0$ (because you killed yourself) -This is not a contradiction - it simply states that $x=0 \lor 1$ (one *or* zero) - -**$\therefore$ both situations can exist (superposition) - suggesting multiple universe theory** - -- Implies a link to quantum mechanics: dead or alive, or between (superposition): -- $1 \over 2$ probability of killing grandfather/self (two parallel realities - Murphy's law) - - -### Many worlds interpretation - -- different branches of superposition are different universes. Perception jumps between universes. -- time can be defined only by the physical state of things at the time - this is the only way it can be derived. therefore, by changing the physical state, you are creating a new "time (or timeline) diff --git a/philosophy/time travel.md.html b/philosophy/time travel.md.html deleted file mode 100755 index 35ff282..0000000 --- a/philosophy/time travel.md.html +++ /dev/null @@ -1,650 +0,0 @@ - - - - - time travel - - - - -

Time Travel and Quantum Mechanics

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What is time?

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Therefore, we have:

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1. Subjective time

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2. Physical time

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All paradoxes arise from the fact that time lapses / flows - we are basing time on subjective time, not physical time

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Concepts of time in physics

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Thermodynamic time arrow

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Block time

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    Are the past and future real?
    -By using the present as a proxy for the past or future, we can simulate them, effectively nesting times inside times (a simpler idea of a time machine - normal time machines lose the idea of the present).

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    2. -
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    Do events that occurred in the past / future exist?

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What is the physical prompt to change to a different time?

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Grandfather paradox

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(case 1) if , then (assuming you don’t die between)
-(case 2) if , then (because you killed yourself)
-This is not a contradiction - it simply states that (one or zero)

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both situations can exist (superposition) - suggesting multiple universe theory

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Many worlds interpretation

- - diff --git a/philosophy/time-coursework.pdf b/philosophy/time-coursework.pdf new file mode 100644 index 0000000..91d8f2f Binary files /dev/null and b/philosophy/time-coursework.pdf differ diff --git a/philosophy/time-travel.md b/philosophy/time-travel.md new file mode 100755 index 0000000..05289c4 --- /dev/null +++ b/philosophy/time-travel.md @@ -0,0 +1,79 @@ +# Time Travel and Quantum Mechanics + +## What is time? +- time is what clocks measure + - measure time objectively, therefore does not help our subjective definition of time + +- $t$ - just like another quantitative variable (period of time, not absolute) + + +- fourth dimension + +- these describe properties of it, not its implications or how it works + - implications are generally determined through intuition + + +- sense of time is inherent to all humans - every human has memory and some idea that time is observable through changes in space + + - computers have memory, do they have a concept of time? + +Therefore, we have: + +**1. Subjective time** +- presumably everyone experiences this notion of time +- has the property of lapsing (time approaches $\infty$) + +**2. Physical time** +- represented by $t$ +- objective +- quantitative (period, not absolute) + +> All paradoxes arise from the fact that time lapses / flows - we are basing time on subjective time, not physical time + +## Concepts of time in physics + +### Thermodynamic time arrow +- second law of thermodynamics: +- total entropy cannot decrease over time (randomness of particles) +- Hence, time has a specific direction (approaching infinite entropy) +- This can be modelled as $t=e$. If $e$ cannot be subtracted from, $t$ can only go one way. +- entropy is an irreversible process +- therefore, time travel backwards is impossible + +### Block time +- time is fourth dimension - all dimensions are related +- universe exists as a whole, in four dimensions, just like a chair can exist in three dimensions (plus time) +- you cannot isolate one value in one of the three dimensions and define it by itself - it would be ridiculous to say that a point ($x=2,y=1,z=3$) can exist if y and z are not defined +- therefore, past and future must also exist as a relation of four values ($x,y,z,t$) + + +2. Are the past and future real? +By using the present as a proxy for the past or future, we can simulate them, effectively nesting times inside times (a simpler idea of a time machine - normal time machines lose the idea of the present). + +3. Do events that occurred in the past / future exist? + +> What is the physical prompt to change to a different time? + +## Grandfather paradox + +- Grandfather is not necessary - could be the suicide paradox +- Mathematical status - 1 bit (dead or alive): + - $x=$ existence at 2 yrs, $y=$ existence at 20 yrs + - $0=$ dead, $1=$ alive +- $x=1$ (alive - assumed because you must exist in the first instance) + + +**(case 1)** if $x=1$, then $y=1$ (assuming you don't die between) $\therefore x = y$ +**(case 2)** if $y=1$, then $x=0$ (because you killed yourself) +This is not a contradiction - it simply states that $x=0 \lor 1$ (one *or* zero) + +**$\therefore$ both situations can exist (superposition) - suggesting multiple universe theory** + +- Implies a link to quantum mechanics: dead or alive, or between (superposition): +- $1 \over 2$ probability of killing grandfather/self (two parallel realities - Murphy's law) + + +### Many worlds interpretation + +- different branches of superposition are different universes. Perception jumps between universes. +- time can be defined only by the physical state of things at the time - this is the only way it can be derived. therefore, by changing the physical state, you are creating a new "time (or timeline)