u/Far_Environment249

I have graduated from high school, the issue is while I am familiar with the mathematical topics, I never did proof based mathematics rather I know stuff just as formulas or facts. Are AOPS problems a good way to go through since, I have lot of time in uni, I believe I can bridge this gap? In general the grads on this subreddit are against AOPS and say its a waste of time.

I have an IELTS band 8.0/9.0 and I am a decent mathematics student. What would be a good starting book for GRE Prep. I have 4-5 months of preparation time. So is it recommended in my case, to get some good books and start solving questions?

I am trying to test my deblurring pipeline on a motion blur dataset, my pipeline requires yaw,pitch,roll and linear acceleration(X,Y,Z). Does anyone know of a dataset for this usecase?

I am unable to set the pins for spi functon on the jetson nano

1. I have tried using jetson-io.py , a waveshare article said it is depricated for the older jetson , i tried setting the pins but they do not work even on reboot

2. I tried following this documentation https://www.waveshare.com/wiki/RS485_CAN_for_Jetson_Nano , the issue is it still says pinmux unconfigured and gpio pins floating

```

$ sudo cat /sys/kernel/debug/pinctrl/700008d4.pinmux/pinmux-pins | grep -i spi

pin 16 (SPI1_MOSI PC0): (MUX UNCLAIMED) (GPIO UNCLAIMED)

pin 17 (SPI1_MISO PC1): (MUX UNCLAIMED) (GPIO UNCLAIMED)

pin 18 (SPI1_SCK PC2): (MUX UNCLAIMED) (GPIO UNCLAIMED)

```

But I have manually set all spi1 associated pins to the following setting

```

$ :~/Downloads/Linux_for_Tegra/kernel/dtb$ grep -A 6 "spi1_mosi_pc0" tegra210-p3448-0000-p3449-0000-b00.dts

spi1_mosi_pc0 {

nvidia,pins = "spi1_mosi_pc0";

nvidia,function = "spi1";

nvidia,pull = <0x01>;

nvidia,tristate = <0x00>;

nvidia,enable-input = <0x01>;

};```

in the related dts

Why are the pins still unclaimed and unconfigrued??

Does anybody have the solutions to Harold Jacobs Geometry Second Edition? I was unable to find good geometry books, I found a one I liked from my library, but unfortunately they do not have any solution manual and I cannot find any online aswell. If someone could help me with this I would be really grateful.

Else could someone please recommend me a similar proof based geometry book with solutions?