37 Matching Annotations
  1. Last 7 days
    1. calculations to converge

      像你提到的这种写法: 1.987(5) 实际上表示的是: 1.987±0.005 也就是说,括号里的 “5” 是对最后一位数字的不确定度。

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  2. Sep 2025
    1. simultaneous

      在狭义相对论中,同时性是 参考系依赖的: simultaneous,同时发生,两个事件在一个惯性参考系中同时发生,但另一个参考系中未必同时发生,所以依赖参考系

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  3. Apr 2025
    1. To be consistent with the action of these operators the spherical harmonic wavefunctions should begiven the correct sign. This convention gives the appearance that harmonics for positive odd values of mhave their wavefunction multiplied by a factor of −1. ThusY1,1 = −√ 38π sin(θ )eiφ (2.17)Y1,0 =√ 34π cos(θ ) (2.18)Y1,−1 =√ 38π sin(θ )e−iφ (2.19)(2.20)17

      Polarisability of harmonic oscillator

    2. ˆl+ |m〉 = ̄h√l(l + 1) − m(m + 1) |m + 1〉 (2.15)ˆl− |m〉 = ̄h√l(l + 1) − m(m − 1) |m − 1〉

      Raising operators for generating higher n,l wavefunctions

    3. Summary of Energy Levels3 integer quantum numbers are needed to describe the scalar solutions for the non-relativistic Hydrogenatom wavefunction (n, l, m).n = 0, 1, 2, 3 · · · 0 ≤ l ≤ n − l ≤ m ≤ +l. (2.13)The energies of the allowed states areEn = − 12e24πε0a01(n + 1)2 = − μe232π2ε20 ̄h21N2 = − RyN2 . (2.14)16

      EN = 1 8πε0a0N2

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  4. Mar 2025

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  5. Feb 2025
    1. ⊢ (((P➝Q)➝(P➝R))➝(P➝(Q➝R)))

      1.show ((P➝Q)➝(P➝R))➝(P➝(Q➝R))) 2. (P to Q) to (P to R) ass cd 3. show (P➝(Q➝R)) 4.P ass cd 5.show (Q to R) 6. Q 7. show (P to Q ) 8.P <br /> 9.Q 10. 11. P to R 1, 2 mp 12. R 4, 11 mp 13. 14.

    2. ((S∨R)➝Q), ~(P∨~S) ⊢ ~(P⟷Q)
      1. show ~(P <->Q)
      2. p <->Q ass id
      3. p to Q 2bc
      4. Q to p 2bc
      5. ((S∨R)➝Q)
      6. ~(P∨~S) **7. show ~p
      7. p ass id
      8. Q
      9. P v ~S 11.** 12.~Q
      10. ~(S∨R) 3, nt **14. show s
      11. ~s ass id
      12. p v ~s 17.**
      13. s v R

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  6. Jan 2025
    1. If Thaddeus won’t study if wisdom isn’t a virtue, then wisdom is a virtue only on theassump@on that virtue makes for happiness

      (~W to ~T) to (W to V)

    2. If unjust conduct is good for the soul, then wisdom is a virtue only if virtue makes forhappiness

      ~U to (W to V)当使用only if句式的时候,consequence出现在actensent前面。

    3. If Ruth reaps what she sows only if virtue fails to make for happiness, then wisdom is avirtue if unjust conduct isn’t bad for the soul

      (R to +v) to (~U to W)

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    1. Logic 1

      validity: no possible and the conclusion is false. Formal validity: every argument with this structure is valid. valid but not formally valid: depend on it meaning

    2. Having cancer is a good thing, for whatever is required by a good thing is itself a goodthing. Being cured of cancer is a good thing, and being cured of cancer requires havingcancer.

      so, Having C is a good thing F P1: Whatever is required T P2: being cured is good T P3: being cure need having C T

    3. If Sarah did the wiring, it was done right. If Marie did the plumbing, then it was doneright. As neither the wiring nor the plumbing were done right, Sarah didn’t do the wiringand Marie didn’t do the plumbing

      P1: If S did wiring, good T P2: If M did wiring, good T P3: wiring, good; plumbing, good T so, S did not do wiring, M did not do plumbing F

    4. If the budget is to be balanced, we will have to raise taxes or cut spending. If we cutspending, then en7tlement programs will have to be cut and Democrats will have a fit. Ifwe raise taxes, Republicans will go ballis7c. So, if the budget is balanced, Democrats willhave a fit and Republicans will go ballis7c.

      PA: If budget balanced either P2: If spending, democrats sad T P3: If taxes, rebuplicans sad. T so, If budget balanced, re sad and pub sad.(F)

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  7. Oct 2024

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